Malicious PDF — malware analysis report

Static analysis result for SHA-256 52056aaac167df3a…

MALICIOUS

PDF

76.3 KB Created: 2021-02-26 19:04:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: d333fccb8ae509f87878ca5e20e57edd SHA-1: f1dff38e092cee784b6fc7084a594f50beb3c89d SHA-256: 52056aaac167df3a52791cf193ed2ac897a46952f75a9d00cd290c0b8f9f99ce
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file is classified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to disposable domains and potentially forming a link farm, suggesting a phishing or SEO poisoning tactic. The document body, though heavily obfuscated, contains keywords related to a movie search, likely serving as a lure to direct users to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9637

Heuristics 6

  • 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 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.
  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://mezovuduw.ru/award?keyword=love+story+movie+2020+south PDF link annotation
    • https://cdn.sqhk.co/faxixuwako/cjdU0id/dowotodavadisuwuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419849/normal_6009dc19e514d.pdfIn PDF document text
    • https://cdn.sqhk.co/merivexasug/qcig7gi/bricks_breaker_779.pdfIn PDF document text
    • http://springwin.space/gottman_feelings_wheelc61ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405902/normal_601208e125fad.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/dOhhgc2/jujeduwikudegutelojonusom.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/jfceRts/virtual_piano_keyboard_with_songs.pdfIn PDF document text
    • https://cdn.sqhk.co/tigoxexuda/icidjcx/2153066074.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481270/normal_5fcafe46b49c2.pdfIn PDF document text
    • http://uaregroup.com/vudejorojejejef9cw1l.pdfIn PDF document text
    • https://cdn.sqhk.co/wevafofed/eHibgjE/8953507095.pdfIn PDF document text
    • https://cdn.sqhk.co/fosojatesog/cgdhbku/jumewikoduj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_602fc503eac21.pdfIn PDF document text
    • http://ellmax-site.xyz/zumujeregitemobokanz8tiz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_601bb2fcdfa6f.pdfIn PDF document text
    • https://pojojupekofep.weebly.com/uploads/1/3/4/7/134754506/faxolewenur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tapewiwesumufug.epizy.com/cursive_standard_bold_font.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D5 5060 bytes
SHA-256: ba5e3d07b680852cc738b6a13d54c9b7f96b7d5f876757d11f506e1b2857ef87
font_01_sfnt_off00010af1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AF1 10240 bytes
SHA-256: f19e9c833a296df36b5859490ce9b968e89c60905d4896e3771bc75c5dc57414

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