Malicious PDF — malware analysis report

Static analysis result for SHA-256 63d4420c0f676f1a…

MALICIOUS

PDF

63.9 KB Created: 2021-05-31 23:25:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae6e516fd65a2dfb2c3dc47236464ca1 SHA-1: 7c16da004b877ddaa52487c73fac60f57a1c2908 SHA-256: 63d4420c0f676f1a62ef2331fe218c3094a7f7edb114d7bc5ab63f21bb08fd73
184 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, appears to be a lure related to 'gear manufacturing process flow chart'. No scripts were extracted, but the presence of numerous external links indicates a potential for redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8496

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/pbw?utm_term=gear+manufacturing+process+flow+chart
    • https://tavigawatogup.weebly.com/uploads/1/3/5/3/135389884/8187537.pdf
    • https://dezilupogebog.weebly.com/uploads/1/3/4/1/134109094/2245674.pdf
    • https://mawurimi.weebly.com/uploads/1/3/4/6/134661678/fuguk.pdf
    • https://liganori.weebly.com/uploads/1/3/1/6/131637073/004c12a.pdf
    • https://mabogafopesusa.weebly.com/uploads/1/3/4/3/134307699/02b1633d4a6ec6.pdf
    • https://bufibetotireguk.weebly.com/uploads/1/3/0/7/130739935/4613012.pdf
    • https://nivewasivok.weebly.com/uploads/1/3/4/4/134479385/22acba.pdf
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fd9efa641a38.pdf
    • https://jupuwova.weebly.com/uploads/1/3/1/4/131409597/fojazimike.pdf
    • https://jugizefabugej.weebly.com/uploads/1/3/4/3/134377355/9093198.pdf
    • https://miwidikanizi.weebly.com/uploads/1/3/4/0/134016908/c29870949ed7708.pdf
    • https://befadileniralan.weebly.com/uploads/1/3/6/0/136082268/3f74be.pdf
    • https://cdn-cms.f-static.net/uploads/4485157/normal_605593a6b9711.pdf
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/d6e64a241a.pdf
    • https://cdn-cms.f-static.net/uploads/4404520/normal_601a9f437e176.pdf
    • https://cdn-cms.f-static.net/uploads/4401976/normal_6039e9ae6ff8b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://visetululiv.pbworks.com/f/.pdf
    • http://lugozamuxika.pbworks.com/w/file/fetch/144421542/flash_all_lock.bat_not_found.pdf
    • http://jajisaparev.pbworks.com/w/file/fetch/144420771/22134004161.pdf
    • http://nikekuva.pbworks.com/w/file/fetch/144414246/slayer_leecher_v0_5.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc90.bin
e7b66fa4a5343b85cac1668ab7dcf7c67fb50cf89424934d719e6a5ebf9056c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC90 4864 bytes
font_01_sfnt_off0000edac.bin
b8f11027880baf9fa8d5752d552b612f73d30b0779df5a88f0be1741393d03bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAC 5552 bytes

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