Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c942121bc26bc20…

MALICIOUS

PDF

71.7 KB Created: 2021-02-26 20:26:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d10a9455d0910bd03f00b4682dfd77d7 SHA-1: 112cfa2da69cbc8c2bb77d2350e9b4b709fabbda SHA-256: 6c942121bc26bc20de32b35544073e519793bb35f506cf76ca00f0def436db7c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially harmful content or for SEO manipulation. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/123?utm_term=how+many+carbs+in+a+small+sonic+blast PDF link annotation
    • https://nusiteraj.weebly.com/uploads/1/3/5/3/135347212/6421573.pdfIn PDF document text
    • https://vavaxumepanev.weebly.com/uploads/1/3/6/0/136097425/diwumafarakitop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373516/normal_6035df556f6fd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449775/normal_60060bac57e03.pdfIn PDF document text
    • https://pijusutuwo.weebly.com/uploads/1/3/1/4/131407307/podawe-zulumikexeduvub-woxaxabos-dijirawez.pdfIn PDF document text
    • https://cdn.sqhk.co/finelega/tiathbt/airplane_crash_dream_definition.pdfIn PDF document text
    • https://simepatu.weebly.com/uploads/1/3/4/2/134267103/giwodadef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_5ffc3afb73303.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427103/normal_5fe410ddb773c.pdfIn PDF document text
    • https://dasatupulike.weebly.com/uploads/1/3/4/1/134131314/migawopanududol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5fe8fc910e00a.pdfIn PDF document text
    • https://bamegipizof.weebly.com/uploads/1/3/4/6/134647446/8051d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_5fe7102d1035d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5240 bytes
SHA-256: 9e8be305552a98279dfce42122836b08a167867e8217802b22506e3c066fbf39
font_01_sfnt_off0000eceb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECEB 10904 bytes
SHA-256: 779842e081d6150e1b48272d3db775a256e739495e63bc42209ffcc03c45401f

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