Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b0c6b8e4389c111…

MALICIOUS

PDF

83.1 KB Created: 2021-03-25 12:26:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: bed5467d3e0c6d4879d3b2ef00df647c SHA-1: b8b0998c201d8b3b80efafb241d9e7c9d23d9d7b SHA-256: 1b0c6b8e4389c1111a97f69fb45f694823b8722e625ab3b3f58bff7685608acd
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to disposable hosting, indicative of a link farm. One of the external links, 'https://resalured.ru/award?keyword=batch+processing+definition+pdf', is flagged as unknown reputation, suggesting a potential malicious destination. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics, along with ClamAV detection, strongly suggests malicious intent, likely related to phishing or SEO abuse.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://resalured.ru/award?keyword=batch+processing+definition+pdf PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/b410b8c1-148a-42f9-af77-6055d3eb6856/what_are_the_symbols_in_the_book_of_revelation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/864303bd-58df-4764-a86c-a46dfda66bbd/26862665540.pdfIn PDF document text
    • https://fa3f2985-242d-4a4c-93c0-6adbfb259eaf.filesusr.com/ugd/8dbe7a_b81d0e6f0c1e4c7dae234c8e81d61033.pdf?index=trueIn PDF document text
    • https://23751d96-d7b3-42ca-b8ca-e459b671ea95.filesusr.com/ugd/7de994_0ac491c3d02249cca668517af36116af.pdf?index=trueIn PDF document text
    • https://3ff4c494-4984-418a-b709-7a5c611cca0a.filesusr.com/ugd/adbee0_b8c8b7cdb1d8487a998b35dda67bd0bb.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_dfbca16b03f145ce8c0a84f6b2d82655.pdf?index=trueIn PDF document text
    • https://b5b764bc-4fc6-48d7-9a4b-423a4d05f225.filesusr.com/ugd/3f2390_91ff334881704a298c480f79a831e745.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/neporezofov/66154335295.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/vefadeluvekomimiwixi.pdfIn PDF document text
    • https://e055bcc9-c4f1-4c6c-8dcb-0912bf54750f.filesusr.com/ugd/b4a829_e3689978e3b94267ba886db50860659e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2bbaf12f-088a-4618-aa9b-330c891b02f2/wojuzuzapapidurosikidobi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0ec27e3-3bfc-41e3-92f6-1e183c8a2058/what_does_son_of_man_mean_in_hebrew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c108dd-5e27-4c48-b84d-bd1aa93185c1/katibunoseb.pdfIn PDF document text
    • https://20996a60-9695-4f45-8fdb-44bdc783da55.filesusr.com/ugd/c57cae_e949491d5414406b876e3dfe983f026c.pdf?index=trueIn PDF document text
    • https://8df9d1b7-8f6e-49e1-bdac-c9da4d4291fd.filesusr.com/ugd/12c198_9d698e76d91b4def95a36b6d9e53e329.pdf?index=trueIn PDF document text
    • https://b4140449-9b96-4148-8619-c9b3eed7b48c.filesusr.com/ugd/c33cdb_12a1d75b318446e98afc1a50eb6bb4dc.pdf?index=trueIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_5feecdadc2044ee88470da1ceef8ea5e.pdf?index=trueIn PDF document text
    • https://fed4949e-3809-4fc0-a28b-84c5d390f589.filesusr.com/ugd/94482e_f555604a96814cdc9d1be3c9f10f342d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f1ede52-1a74-4ece-a300-8aef41165131/how_many_hours_do_full_time_employees_work_a_week.pdfIn PDF document text
    • https://387a498e-9551-4239-9507-3183ba214552.filesusr.com/ugd/cd403b_c830faae4074499bba8de37e6f717de7.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_211070b120504466b39fea985441ee1f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/zevugudiwile.pdfIn PDF document text
    • https://71e5fc8e-cc9a-4633-96c3-2c70acd464d0.filesusr.com/ugd/f08e01_06579b4a171a46808ada78a1f1d4e298.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b7d6f2a-6b56-4dfa-b506-106f046d0024/juded.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5220 bytes
SHA-256: 0fc0d588fdf5ee9136e5331b55552905fc3eeed07de8503bccb749e4235bf10d
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11552 bytes
SHA-256: 654680aba7f2523c3dac47e662c5364130c5967d02ece6b2ffae8bc5d37d89e9
font_02_sfnt_off0001306b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306B 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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