Malicious PDF — malware analysis report

Static analysis result for SHA-256 e458c6d9ecf46c45…

MALICIOUS

PDF

109.9 KB Created: 2021-03-20 02:44:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 535d57426b8b31e9ddaaf765a5e175f3 SHA-1: 4aa6c2c88c3c38d7d1b0336aadf5d4da8716558a SHA-256: e458c6d9ecf46c451ed0e51d645f2d225524393e126642b5cfa0a3628a00c840
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links pointing to external sites, with one prominent URL being zajinet.ru. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://zajinet.ru/award?keyword=parliamentary+form+of+government+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4385417/normal_602e7a2c89a19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5ff603e299b36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386333/normal_604d225dd8857.pdfIn PDF document text
    • https://kemebawe.weebly.com/uploads/1/3/5/3/135313751/355cb30c19829.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489713/normal_601ec83756049.pdfIn PDF document text
    • https://peturenu.weebly.com/uploads/1/3/4/4/134401199/cc9dbd2b45b.pdfIn PDF document text
    • https://wavasifowimuzog.weebly.com/uploads/1/3/5/3/135321241/disajif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_60166821d991a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426279/normal_600ca3fa1e90e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446170/normal_5fc86ae82c794.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365555/normal_5fdea46399ae4.pdfIn PDF document text
    • https://kenaveduku.weebly.com/uploads/1/3/0/8/130813649/jemonon.pdfIn PDF document text
    • 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/5fa44e28-1274-4b88-972d-41a2d7615e4c/focusrite_scarlett_18i20_2nd_generation_driver.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_60ba9873ba454a9f9133bb02ad51acd4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ead710e-51d2-49c1-a77a-00d24ed3c31a/96737860423.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0e72c66-f7c4-4444-977b-272dee6d61d0/2008_ford_escape_hybrid_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb1d79bf-f88d-46df-9d0b-e65fe0c04543/dalalumixunomad.pdfIn PDF document text
    • https://s3.amazonaws.com/saxefi/news_reporter_salary_aaj_tak.pdfIn PDF document text
    • https://69f1164a-dcd3-4310-9fb4-3b67f03bdbb0.filesusr.com/ugd/9d7282_015cc1ee4fc04461b6479f5760fbbf9b.pdf?index=trueIn PDF document text
    • https://a32e93c2-1aa3-4149-af29-aa5d163ab988.filesusr.com/ugd/40336e_be94b2322cae4854b7b66bebcfd3415c.pdf?index=trueIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_b11a999d833948bc9f64c3107b8e2eff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/free_printable_3rd_grade_fractions_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67df41b8-2019-4843-86e6-a19a483fd2e5/how_to_clean_fisher_price_swing.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_off0001616e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1616E 5136 bytes
SHA-256: 8e2e5680fa9394cd717de1cb53ce9fd170471adaec80f32e040504593106f3bb
font_01_sfnt_off000172dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172DD 12684 bytes
SHA-256: a5c0c2c39691a11a21d99ddc30d6a63aa37eb694fba3a34443be8d600997da13
font_02_sfnt_off00019b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B5A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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