Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbacd936d1d156e3…

MALICIOUS

PDF

69.4 KB Created: 2021-06-10 15:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c9ebea5c99fdd4bbafa73454f933b825 SHA-1: 09c2b102985c1df969b91375dee65bf6092b7a3f SHA-256: bbacd936d1d156e3816eff35e46bc5d35b606ce55925ee44ce767d7fde0b05ac
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, characteristic of a link farm designed to redirect users. The embedded URLs suggest an attempt to lure victims to malicious sites, likely for phishing or further malware delivery.

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://catamma.ru/pbw?utm_term=mp3+cutter+video+to+audio PDF link annotation
    • https://tebokefabizanil.weebly.com/uploads/1/3/4/8/134866802/a72fd200f241.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377377/normal_605d677f28c5f.pdfIn PDF document text
    • https://lewixixidofuj.weebly.com/uploads/1/3/4/3/134393564/remazot.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_60326be233198.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472182/normal_603b4a2db5611.pdfIn PDF document text
    • https://pagopolekabob.weebly.com/uploads/1/3/4/3/134305888/fodole.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425492/normal_604e46c86666a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5ff7bf81821bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480582/normal_601369e8cd2ce.pdfIn PDF document text
    • https://noxazifegem.weebly.com/uploads/1/3/4/5/134596672/bufige.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490961/normal_602a96317cb30.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476596/normal_6061ffc758dcc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389353/normal_5ffe303890835.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://najapenoz.pbworks.com/w/file/fetch/144542427/what_are_attributive_and_predicative_adjectives.pdfIn PDF document text
    • http://pibadaro.pbworks.com/f/tabiginaxujalafire.pdfIn PDF document text
    • http://papoxuva.pbworks.com/f/98014691936.pdfIn PDF document text
    • http://liralafum.pbworks.com/w/file/fetch/144935628/26585304081.pdfIn PDF document text
    • http://mupalunava.pbworks.com/f/kopafulisile.pdfIn PDF document text
    • http://luwivaj.pbworks.com/f/client_satisfaction_survey_template_free.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DD 5084 bytes
SHA-256: c5a1f36bc9fdc93757d896c9eb4d9f86fbab8844c0f958a898e77f8dea028b14
font_01_sfnt_off0000e54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE54C 10292 bytes
SHA-256: 8393baec77fc87d3f6ea94e8bce0d21f3a91d0a2534f4bc092c97e32c98142ef

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