Malicious PDF — malware analysis report

Static analysis result for SHA-256 94f4ea8172ea9ade…

MALICIOUS

PDF

78.3 KB Created: 2021-05-31 05:07:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6675ca1d947642f64cf278c4555149a SHA-1: 672cbb2d64a43a860a2ee786166fbf52012b327f SHA-256: 94f4ea8172ea9adef5cd5db0c7fd0eeb568e0b48b7379c6fce50ab4d68030047
164 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical finding for a link farm and a ClamAV detection for a phishing trojan. The embedded URLs suggest an attempt to redirect users to malicious sites, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL findings strongly indicate malicious intent.

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
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://soxebez.ru/123?utm_term=minecraft+education+edition+bedwars
    • https://cdn-cms.f-static.net/uploads/4481068/normal_60103cd58d261.pdf
    • https://cdn-cms.f-static.net/uploads/4392472/normal_5fda90c2d1826.pdf
    • https://static.s123-cdn-static.com/uploads/4412584/normal_6008b52c3d119.pdf
    • https://cdn-cms.f-static.net/uploads/4488817/normal_603aa3d618d27.pdf
    • https://jonukejunuxesa.weebly.com/uploads/1/3/1/4/131409236/72abd08b00daed.pdf
    • https://mabaxezo.weebly.com/uploads/1/3/4/7/134766945/kujib.pdf
    • https://static.s123-cdn-static.com/uploads/4466391/normal_5ffd6c4c5fbf7.pdf
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5ff9bc0c150b6.pdf
    • https://cdn-cms.f-static.net/uploads/4401540/normal_602785e71ad4a.pdf
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6061890d3cc60.pdf
    • https://rijujofa.weebly.com/uploads/1/3/4/3/134323569/nasivivosewavavusetu.pdf
    • https://cdn-cms.f-static.net/uploads/4475380/normal_606198916159d.pdf
    • https://cdn-cms.f-static.net/uploads/4381551/normal_5fe9179f82432.pdf
    • https://saxenivimagi.weebly.com/uploads/1/3/0/8/130813604/gisokilab_gipesadudo_xofowenog.pdf
    • https://lababober.weebly.com/uploads/1/3/5/3/135329518/6803539.pdf
    • https://popugimamad.weebly.com/uploads/1/3/0/7/130775647/6a48413d22.pdf
    • https://jiwedizuku.weebly.com/uploads/1/3/4/3/134310564/4829f7fe5d.pdf
    • https://muvaxajipafe.weebly.com/uploads/1/3/5/3/135313420/9042029.pdf
    • https://wopamogifit.weebly.com/uploads/1/3/4/3/134341426/ranufedodidifi.pdf
    • https://cdn-cms.f-static.net/uploads/4391620/normal_605b50ade9ac6.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_off0000ec91.bin
ecf096333236cd468c304e2086fe9987f2d1a99c434d5512a42bdd3a3165285a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC91 5220 bytes
font_01_sfnt_off0000fe7e.bin
d14dc6fbcb925df9529bea9dcb4538bc93095976af8af5881efa463955cc445f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7E 18548 bytes

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