Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea1b8f3dfd12a98…

MALICIOUS

PDF

88.8 KB Created: 2021-05-01 21:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2836225448bdaeb4909b993836326517 SHA-1: 701b52f55ee471dd9fe8d5fe5707988df6ce3459 SHA-256: 2ea1b8f3dfd12a98f32e257e762397943442261e383fd021db46d089bc5db3d0
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=how+do+you+use+the+everstart+jump+starter+750+amp PDF link annotation
    • https://cdn.sqhk.co/zoxowowi/hijaCWz/jibesi.pdfIn PDF document text
    • https://cdn.sqhk.co/xumelesep/f4Kii61/2657552262.pdfIn PDF document text
    • https://cdn.sqhk.co/rojogonezejo/j3SmmT8/18143152298.pdfIn PDF document text
    • https://cdn.sqhk.co/rikopekela/gejgjge/98913636311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/satulibaren/fftcg_deck_registration_sheet.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_61885618df944f47b424523372f9bc4c.pdf?index=trueIn PDF document text
    • https://7b9449e5-51e9-4a7e-81f5-8587c42320f9.filesusr.com/ugd/571bad_c1191da47ea04a269a59dd3245b40f76.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9355d57b-db7b-404a-ab95-150379caa9a6/lazosumiwogim.pdfIn PDF document text
    • https://f85e9a30-dbb9-40fd-a66d-53bd7daafe07.filesusr.com/ugd/1b9faa_a057be04d7ab489aa284305045829bfb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/47241883-5110-4155-a33e-d12751bac1b1/nj_transit_fare_enforcement_officer.pdfIn PDF document text
    • https://82656f1f-dd0f-4426-89ca-c5688288f975.filesusr.com/ugd/56de54_9b40597c97dc47aa956f51820d129d98.pdf?index=trueIn PDF document text
    • https://c2245d91-bd3f-4016-bed3-1da34bcfd793.filesusr.com/ugd/9a652e_e94dc0747d9045a3841baf99f828a8e2.pdf?index=trueIn PDF document text
    • https://441768bb-9839-4df4-8f78-dd1233b527f6.filesusr.com/ugd/7e6080_5ac6109d8ca84f658329a0934c306cc0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7048b9b-76f4-488d-b28b-32bd23b4c0f6/51537216638.pdfIn PDF document text
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_06491d89aef344658a09123189f9d855.pdf?index=trueIn PDF document text
    • https://44879a12-c10a-431c-a98a-7de142752d0f.filesusr.com/ugd/bb4607_d9dad5079c3e47c8921ff201edaf79f4.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_826312c9702b44eb86ba5b6fdd540269.pdf?index=trueIn PDF document text
    • https://f5071db7-799c-4807-8cfa-c66b012f33b1.filesusr.com/ugd/9a4546_4279d67dda8a41e18cad2f6a7d571867.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ginutu/5533929320.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/73793374350.pdfIn PDF document text
    • https://6acf0ca1-aa41-4771-8b91-54baff69ee7f.filesusr.com/ugd/7d1dc9_b2bac523587b414db3924044fdb6c9a9.pdf?index=trueIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_c1c12f634e524c139c754b9e3803745f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8baeeba-8d5d-4989-b546-0988f4a6f1aa/4_quart_crock_pot_simple_recipes.pdfIn PDF document text
    • https://s3.amazonaws.com/wefadep/galugugabaluk.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001176f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1176F 5804 bytes
SHA-256: 3cb98f0f240b76841deb087edd8d48a7257c903a28df91a8c94c053fee16b3d7
font_01_sfnt_off00012b34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B34 12764 bytes
SHA-256: 9ee3af3d0d28ad8829844d23b1d7c149c5573c87a5795e04746c971f55b29017

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