Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6266db2fea688ff…

MALICIOUS

PDF

86.6 KB Created: 2021-03-15 22:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 770f7e9ec18796491db0e0c0f901a6a6 SHA-1: 7fa44b8c4373bb84c71e13b27b4c700d644de153 SHA-256: b6266db2fea688ff741f7fd0e28b015b16bfa61c2ec175fdc3ec65d7f2ffad1d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=sword+art+online+anime
    • https://cdn-cms.f-static.net/uploads/4401692/normal_6042dd8f1c966.pdf
    • https://static.s123-cdn-static.com/uploads/4478670/normal_5ff4b2c18ec12.pdf
    • https://mawebexakonu.weebly.com/uploads/1/3/4/3/134390129/3411840.pdf
    • https://kasorewo.weebly.com/uploads/1/3/2/7/132740312/nixugurirarivobilu.pdf
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/pazogizidorired-jigiwanizi-xuwexuwabokak-ginupen.pdf
    • https://static.s123-cdn-static.com/uploads/4380210/normal_5fdf59a268e66.pdf
    • https://cdn-cms.f-static.net/uploads/4374980/normal_604d1225ccc83.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2c9641c8-5874-4869-9b94-f1378e60aa6b.filesusr.com/ugd/efc1f6_da85db586d334055be0a465a33e1ff1c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8612d0b8-323a-4f8b-bc24-f1ffe30ed7c4/metikobufozatitolor.pdf
    • https://s3.amazonaws.com/gewuwasi/84871563210.pdf
    • https://s3.amazonaws.com/gelawiweza/26446528277.pdf
    • https://s3.amazonaws.com/tokafanawa/cheiro_numerology.pdf
    • https://s3.amazonaws.com/rexogeguxosix/guzunofodaxojekitodubupes.pdf
    • https://uploads.strikinglycdn.com/files/345c0546-4bea-435f-9432-20b0b566dd55/can_you_work_at_walgreens_at_15.pdf
    • https://uploads.strikinglycdn.com/files/52006feb-a085-4d9a-9708-0d2f01fead81/munavalifomudomewubomuwix.pdf
    • https://uploads.strikinglycdn.com/files/39e6eeb0-c436-406d-87d3-04744545dfac/rulitajenunisimufifojanes.pdf
    • https://s3.amazonaws.com/vojapu/causes_of_air_pollution_in_china.pdf
    • https://ce3a146a-d504-4efb-981c-4593fb85d965.filesusr.com/ugd/5b5da7_64595ccfe9f0499089d9b0dc42ce47c6.pdf?index=true
    • https://s3.amazonaws.com/gafedupeba/puremitav.pdf
    • https://s3.amazonaws.com/resixexi/believer_s_authority_free.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000115e6.bin
704837d9921954a2527d4515f9b3c3201e018a0eac67676c31e218ba5ee44b07		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 4988 bytes
font_01_sfnt_off000126d6.bin
589c6e28fb3e8d70b92670828708cc996116091e5763104dc932dfed0c659f44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126D6 11496 bytes

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