Malicious PDF — malware analysis report

Static analysis result for SHA-256 de40244e3dd5fbac…

MALICIOUS

PDF

85.8 KB Created: 2021-06-03 13:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fb18ec20b3642c04802e3dfef6737133 SHA-1: 3af805ec3c2bfc137626ef2e588d0a42104010f9 SHA-256: de40244e3dd5fbac07a0ca5130ebb802f2179eca6075854b3c91055ab40328a6
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to drive traffic to specific search terms. The primary URL points to a search result for free song downloads, a common lure for phishing or malware distribution. ClamAV and ML heuristics also flagged this PDF as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6907

Heuristics 4

  • 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
  • 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://archism.ru/pbw?utm_term=lr+eswari+amman+songs+free+download+masstamilan
    • https://cdn-cms.f-static.net/uploads/4384318/normal_606b8683d2e1a.pdf
    • https://cdn-cms.f-static.net/uploads/4476582/normal_60206d611eb88.pdf
    • https://cdn-cms.f-static.net/uploads/4455657/normal_6013261f5cd80.pdf
    • https://cdn-cms.f-static.net/uploads/4379486/normal_6017b98b15fa2.pdf
    • https://fedibikora.weebly.com/uploads/1/3/4/5/134508081/dewapore.pdf
    • https://cdn-cms.f-static.net/uploads/4469828/normal_60228d5cc2094.pdf
    • https://pejifote.weebly.com/uploads/1/3/5/3/135348690/nupewi_rugufufoz.pdf
    • https://static.s123-cdn-static.com/uploads/4499329/normal_5fde9dc2c99d8.pdf
    • https://cdn-cms.f-static.net/uploads/4386613/normal_606c751a13ebf.pdf
    • https://static.s123-cdn-static.com/uploads/4447630/normal_5fcb20dc903c1.pdf
    • https://static.s123-cdn-static.com/uploads/4378406/normal_5fc96c8269bbc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/14b35814-6585-4f6d-83f3-111b8caa9eb0/shadowrun_video_game_review.pdf
    • http://zabodovojif.pbworks.com/w/file/fetch/144426150/xomoki.pdf
    • https://uploads.strikinglycdn.com/files/8d64275d-f303-4c58-9bc0-990e813832d7/how_do_you_use_wella_koleston_perfect_hair_color.pdf
    • http://redejok.pbworks.com/w/file/fetch/144488898/dreamweaver_cs6_full_crack_indir.pdf
    • http://bopelijexuf.pbworks.com/w/file/fetch/144450093/mechanical_shaker_principle.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000123f4.bin
8e08893453115a9b5b6363e45c7469d402becb74275b77fb24c4f4fde09701d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123F4 4400 bytes
font_01_sfnt_off00013394.bin
3982bd1905c0f95621a0bfc0ebaa38fa5771419679b7a5152c2166558700529c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13394 5048 bytes

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