Malicious PDF — malware analysis report

Static analysis result for SHA-256 264e85a3e8441f40…

MALICIOUS

PDF

76.2 KB Created: 2021-02-07 15:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 73573a43271994d3bb5f47d8c2fa9aed SHA-1: 83704e6c9acfab33fff1806e460be1634dabcff5 SHA-256: 264e85a3e8441f40c404281355c46d8164509549685279623d625cb7e34d76b5
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, identified as a link farm, with a deceptive lure related to birthday videos. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to a network of potentially malicious or spam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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
  • 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://bologen.ru/wb?keyword=birthday%20video%20song%20with%20name PDF link annotation
    • https://jedopebo.weebly.com/uploads/1/3/4/8/134889916/lemefo.pdfIn PDF document text
    • http://islemleriniz.org/4779210147197ypu.pdfIn PDF document text
    • https://wekupadafar.weebly.com/uploads/1/3/5/3/135315244/3903897.pdfIn PDF document text
    • https://lovapunosarimol.weebly.com/uploads/1/3/5/4/135401421/346d21df0d.pdfIn PDF document text
    • https://bosagibanili.weebly.com/uploads/1/3/2/6/132682134/a597928410ec4.pdfIn PDF document text
    • https://nupewaxupojiga.weebly.com/uploads/1/3/4/0/134042887/xojabogepefije.pdfIn PDF document text
    • http://dithetsen.xyz/the_martian_movie_worksheetzx6gl.pdfIn PDF document text
    • https://wulafuxuzezam.weebly.com/uploads/1/3/2/3/132302924/4655559.pdfIn PDF document text
    • https://cdn.sqhk.co/juvebuzizej/KU7GgcZ/ice_cream_truck_for_sale_craigslist_san_antonio.pdfIn PDF document text
    • https://batozovij.weebly.com/uploads/1/3/1/4/131455337/9063277.pdfIn PDF document text
    • https://nibafokabatawal.weebly.com/uploads/1/3/0/9/130970001/6732940.pdfIn PDF document text
    • https://woxukobu.weebly.com/uploads/1/3/4/3/134392577/6965544.pdfIn PDF document text
    • https://zaxixeresez.weebly.com/uploads/1/3/1/8/131871416/7960462.pdfIn PDF document text
    • https://bulugigedi.weebly.com/uploads/1/3/4/7/134714886/posulume.pdfIn PDF document text
    • https://xotubowewetiner.weebly.com/uploads/1/3/2/6/132696149/rawisotofofuli_pajeve_tovavek.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 5300 bytes
SHA-256: 44e521e0ba18df45d69d5f92aebe7ab36b2e9b1a37315fad7adb538fd79939e6
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 11728 bytes
SHA-256: ad298231b512be74ca27e864a6113b45b58e1b93f9ee611ddd110f1e793fb59a
font_02_sfnt_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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