Malicious PDF — malware analysis report

Static analysis result for SHA-256 9857acdce67abfd8…

MALICIOUS

PDF

70.8 KB Created: 2021-02-27 23:52:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1515032ed312f20e495c05c5acf38f99 SHA-1: 941e1e234c3f9a38f1c433879562701057b6bd3d SHA-256: 9857acdce67abfd8375eba6557545f505dda3fe048334d22b5f33c1f5ed73e60
186 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, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily corrupted, appears to be a lure related to car mileage, likely designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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
  • 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://vilenefex.ru/aws?utm_term=how+many+miles+can+a+2008+honda+civic+hybrid+last
    • https://static.s123-cdn-static.com/uploads/4451225/normal_600281bf6b3fb.pdf
    • https://rixafewokeget.weebly.com/uploads/1/3/0/7/130739987/gavuxojowijimerowa.pdf
    • http://pagebake.com/asus_tinker_board_android_8v66jf.pdf
    • https://wimiwimevodozaz.weebly.com/uploads/1/3/0/8/130874111/4189207.pdf
    • http://reetodo.online/zuzurevetepizudepijuwinif40oi.pdf
    • https://cdn-cms.f-static.net/uploads/4378641/normal_6027ce97e57ea.pdf
    • http://moneyindia.site/bugepovemufunodadopizubtalbj.pdf
    • https://noduxulab.weebly.com/uploads/1/3/4/9/134901810/jubiketirid.pdf
    • https://static.s123-cdn-static.com/uploads/4447641/normal_5ff88073c29d6.pdf
    • https://vubufogos.weebly.com/uploads/1/3/4/7/134766152/8b636e8.pdf
    • http://duwudivusupo.mygamesonline.org/17852995498.pdf
    • https://wujibinofowe.weebly.com/uploads/1/3/1/3/131383737/bufaxawusanuwil.pdf
    • https://fovojewonot.weebly.com/uploads/1/3/4/6/134669065/425f623f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off0000d588.bin
2ee498184fdfad9fd97544320edcafcad7612ab1cb7cd4a2bc2e95c57480386a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD588 6000 bytes
font_01_sfnt_off0000e9d9.bin
7a1819d64dcf2888baa02203b707ceb208d6a6bb5562514bd04d5a7b7c6203cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D9 10552 bytes

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