Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1e6c33b7378e248…

MALICIOUS

PDF

82.1 KB Created: 2020-12-20 01:37:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 797faf27d0876dae19984241851d4290 SHA-1: 7aaad1d443d49a83db032b877dba86751f6f14f6 SHA-256: b1e6c33b7378e24844f372460974ffb95e808ec785e05a77446c378c9f23cb16
176 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm'. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, a common tactic in phishing and tech support scams. While no scripts were explicitly extracted, the presence of external links and the callback lure strongly suggest a phishing or social engineering attack. The ClamAV detection further supports the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://trafffe.ru/strik?utm_term=munkres+topology+solutions PDF link annotation
    • https://sejabekozifox.weebly.com/uploads/1/3/4/2/134266090/6714269.pdfIn PDF document text
    • https://sirawomaperuli.weebly.com/uploads/1/3/1/3/131398091/wurixapuger.pdfIn PDF document text
    • https://jiwadurator.weebly.com/uploads/1/3/0/7/130776405/5487867.pdfIn PDF document text
    • https://voruvagozi.weebly.com/uploads/1/3/4/7/134742827/4715183.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf4ec3c6ccf69f323f9d1/1606284525895/viwikowojapudoxonukanez.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd37863f59a2572d8ffde5/t/5fde54e55809ae3434f85198/1608406245334/graphs_in_annual_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/dukavunivifa/learn_russian_ebook.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc3d8d31452f90b7ff7981f/t/5fcfdd0e56ffb921e7761bce/1607458062743/jomexemiriwuvezesi.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc115278ef7301f8b11bee7/t/5fcb487a6e74d26c6ffcaa9b/1607157890337/celebrity_cruises_2020_cancellations.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2ba1840f1034a5cb4c0bb/t/5fc6a249bc819f1cf4c1df8c/1606853194356/romantic_ringtones_for_husband_calling_download_tamil.pdfIn PDF document text
    • https://s3.amazonaws.com/jamokaroxoj/46169414008.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd52f8c2d4633280e99069/t/5fde7e48463d3b6c6f375e4d/1608416840218/geposoreven.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc59b9da13a450bab147422/t/5fc9935e414f5e3523727c1b/1607045983403/ibis_paint_x_para_pc_windows_7.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010e93.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10E93 25492 bytes
SHA-256: 63827281e491f986e544d8738686ae82c0790bcbc0ca679277a16c23cddc5b01
font_00_sfnt_off0000d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD614 4948 bytes
SHA-256: 814487919c9aa4f668d48a90518e640e163c4a66b42e8e30760f5d7c77e49188
font_01_sfnt_off0000e716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE716 11584 bytes
SHA-256: 9372d5fc1506213160a85c537714ef4c7b51fa6691d9bcfa8df9694178c0f1f2

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