Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad38d375db656fe…

MALICIOUS

PDF

75.5 KB Created: 2021-05-16 20:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c0762331aaa8742a9229d501c291477f SHA-1: c08ed37d7f8f4d2efa258f5015c759195f5fcaab SHA-256: 2ad38d375db656fe6889e1647a430ad8204dd268dc0958f4387ad5baf306bc51
186 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, many of which point to disposable hosting services. This behavior is indicative of a link farm or phishing campaign, designed to redirect users to malicious websites. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive content, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9725

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
  • 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://soxebez.ru/strik?utm_term=persuasive+writing+ideas+for+high+school PDF link annotation
    • https://cdn.sqhk.co/pigajifaw/thjhad4/fabakebuf.pdfIn PDF document text
    • https://vumerajijo.weebly.com/uploads/1/3/2/8/132815742/pokufibogebemom_jirewedowi_kawinivuwevaxit.pdfIn PDF document text
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/desavewunuvip-vogimijaxav-betiwitavusuk.pdfIn PDF document text
    • https://navubenawegef.weebly.com/uploads/1/3/4/3/134320789/01a3e71ede.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/e1d4cfb.pdfIn PDF document text
    • https://cdn.sqhk.co/kogoruzojif/hh5UheS/27780706459.pdfIn PDF document text
    • https://murarukaxew.weebly.com/uploads/1/3/4/6/134666391/a2c8ac4b9.pdfIn PDF document text
    • https://lofusomibebez.weebly.com/uploads/1/3/2/7/132740423/jitixigaka.pdfIn PDF document text
    • https://dasajusowerav.weebly.com/uploads/1/3/1/6/131637273/gozarovuwotufarawel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lajirobodogew.epizy.com/98038928820.pdfIn PDF document text
    • https://69cf8a46-0d3d-4b71-8fd1-93df925da18e.filesusr.com/ugd/e4064d_57af3a7f2b874fb0b7b11dba539448e2.pdf?index=trueIn PDF document text
    • https://3c199e1c-ff83-4553-a351-db1e9419129c.filesusr.com/ugd/424a74_6967b38bcb7a4dd7917da11140936c8a.pdf?index=trueIn PDF document text
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_a90cbbc19d7d42638d5f6db6c974b23b.pdf?index=trueIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_19b15884521643fa92af378611b5e550.pdf?index=trueIn PDF document text
    • http://gifetezese.rf.gd/67211395414.pdfIn PDF document text
    • http://xomedejufe.rf.gd/36365074070.pdfIn PDF document text
    • http://xadifoduboboriv.rf.gd/equidad_y_movilidad_social.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_off0000f58d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF58D 5436 bytes
SHA-256: 3fbe8ac2120549606aa44635b9e878a1d8f062a7a3e73eb8ec517d90913d3461
font_01_sfnt_off0001081d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081D 10972 bytes
SHA-256: eb46c7776f4a41c3c60fbf1914e04764dfc78e2f1df558a19d2b9085734d873d

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