Malicious PDF — malware analysis report

Static analysis result for SHA-256 c36881d35b11c3e2…

MALICIOUS

PDF

79.8 KB Created: 2021-05-20 06:21:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a70bc3aaba7fdccf7e856954076121eb SHA-1: 7b94169bb4ffd4ebea3e89d4431c41d90fedb816 SHA-256: c36881d35b11c3e2a99e2913db882bf8eeb2043e820eea06ebdd787021bd118e
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted files, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://seumenha.ru/strik?utm_term=elements+of+programming+interviews+the+insiders%2527+guide+c%252B%252B+pdf', is designed to mimic a search result for a technical book, likely to trick users into downloading malicious content or visiting phishing sites. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://seumenha.ru/strik?utm_term=elements+of+programming+interviews+the+insiders%2527+guide+c%252B%252B+pdf
    • https://gogozofoful.weebly.com/uploads/1/3/4/5/134512065/lidufifagi.pdf
    • https://cdn-cms.f-static.net/uploads/4491426/normal_605c6bad55ec5.pdf
    • https://cdn-cms.f-static.net/uploads/4369914/normal_6032c922f0262.pdf
    • https://cdn-cms.f-static.net/uploads/4464722/normal_604a9b42ce560.pdf
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/6b3bdc36.pdf
    • https://kitawusew.weebly.com/uploads/1/3/4/2/134234725/7794227.pdf
    • https://kugasesilij.weebly.com/uploads/1/3/4/7/134702015/dadaxozomevotubamulu.pdf
    • https://cdn-cms.f-static.net/uploads/4460970/normal_6036737e75fb9.pdf
    • https://kojepogezoxuta.weebly.com/uploads/1/3/4/4/134487575/xomuzuju-bekowopiwi-wigil.pdf
    • https://sadibagisu.weebly.com/uploads/1/3/4/7/134758630/zorizitebofegi_vadonujiliwusi.pdf
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/5c41a47.pdf
    • https://tidoxanarapora.weebly.com/uploads/1/3/2/7/132710787/womokulusogu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/4ba0553d-828c-41c6-adec-3983ddfc122f/72464863310.pdf
    • https://uploads.strikinglycdn.com/files/0c809053-df6f-4eb8-ada9-2e3a33e31164/how_to_hook_my_directv_to_the_internet.pdf
    • https://uploads.strikinglycdn.com/files/e63beb3f-0448-4b43-bad5-82ceb3844d18/58346707694.pdf
    • https://uploads.strikinglycdn.com/files/43a903a4-6794-4b77-a060-bac4e1a39cc0/walige.pdf
    • https://s3.amazonaws.com/lomogas/instagram_application_for_pc.pdf
    • https://s3.amazonaws.com/tumasun/imperial_length_conversion_worksheet.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_off0000f6fe.bin
440e12207b83eb112fd21d5b6eafed502bee0594561c52c52a0c218cfb5a2b0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 5712 bytes
font_01_sfnt_off00010a61.bin
5142203aece85ad56f804fa9be3e9a9d8b1b9c6cb75891c50edd89d13c508ba8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 11624 bytes

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