Malicious PDF — malware analysis report

Static analysis result for SHA-256 946f347348ec3db9…

MALICIOUS

PDF

77.5 KB Created: 2021-02-11 16:05:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2783245c8eaa5cf168c7aec335ddd159 SHA-1: c05e0fe551b6330a99621c82e1e62a88cc793ddd SHA-256: 946f347348ec3db972c5308ab064fc8d9e2861bccbf23bc9c6b5f3c4b55ef3ba
176 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a large number of external links, suggesting a link farm or a phishing lure. The 'SE_CALLBACK_LURE' heuristic indicates the document might be designed to trick users into calling a fraudulent support number, a common tactic in phishing scams. No scripts were extracted, but the presence of numerous external URLs points towards a malicious intent to redirect users to potentially harmful content.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jottigo.ru/123?utm_term=hse+training+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4387241/normal_6010c09562e9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426551/normal_5ff612d92f483.pdfIn PDF document text
    • https://cdn.sqhk.co/waximanodif/ibie9tM/hole_io_2000.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366324/normal_5fc5d3e0a3c2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_600cb94be1f27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426418/normal_601387018c950.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/jiij6gd/sustainable_development_goals_malaysia_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378613/normal_5fd94332b2866.pdfIn PDF document text
    • https://cdn.sqhk.co/lilavokolet/5iiFgfX/lawokasesegivof.pdfIn PDF document text
    • https://xaviguvugunaji.weebly.com/uploads/1/3/5/3/135313722/e165b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478414/normal_6000d8dd71994.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389801/normal_5ff44a99016ba.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/gjZU7du/50363973719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_5fd3dc0b03935.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/tefufugapowuj-kejemerolokavar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dalava/socrates_pain_assessment.pdfIn PDF document text
    • https://s3.amazonaws.com/gewisetug/13105691913.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_off0000f38f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38F 4920 bytes
SHA-256: fb63dd8d2c71be5f82fb30afd51ba419d3d72036b7d85bb6d981f547a5a0f46f
font_01_sfnt_off00010456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10456 10764 bytes
SHA-256: ebc6f45081ccee045eab2491670e572bc8da11ad7877af9af1aabdee83c79650

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