Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b53670a1138012…

MALICIOUS

PDF

102.6 KB Created: 2021-01-04 22:10:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 84a1487a1a1429de63f370564ad8fd84 SHA-1: 601504dcd97d4b6ebb55c58e96a1dd7799816119 SHA-256: a2b53670a1138012ea5885d9f4e02e7ae23d484a8b321d6bd3ef5cb335433fc3
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. The document presents itself as "Economics chapter 3 and 4 test answers" to entice users to click on embedded links, which are part of a link farm hosted on disposable domains. The primary URL observed is https://trafficel.ru/123?utm_term=economics+chapter+3+and+4+test+answers, suggesting a phishing or redirection attempt.

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://trafficel.ru/123?utm_term=economics+chapter+3+and+4+test+answers PDF link annotation
    • https://wezogefizu.weebly.com/uploads/1/3/4/2/134234847/cc84d.pdfIn PDF document text
    • https://mepagalupotope.weebly.com/uploads/1/3/4/2/134265457/8214228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464521/normal_5fd08dbaeffd9.pdfIn PDF document text
    • https://lakiromepokina.weebly.com/uploads/1/3/4/5/134589127/rusurafesowegomema.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385421/normal_5fb5e47c34011.pdfIn PDF document text
    • https://votuwokikinoso.weebly.com/uploads/1/3/4/4/134466575/2821227.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/8816750.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483365/normal_5fcef98db9d83.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/UQLMM5E/kudawexomaroz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406169/normal_5ff1bda898300.pdfIn PDF document text
    • https://rojanebe.weebly.com/uploads/1/3/1/6/131637229/054a27d8.pdfIn PDF document text
    • https://noxetetejiv.weebly.com/uploads/1/3/4/3/134391164/3e41b752b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384632/normal_5f9263ef974e6.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
    • https://s3.amazonaws.com/baposivarabuj/bugurax.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001481a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1481A 5368 bytes
SHA-256: f0420611f1251cd0a28160d946dabf8bd1cf1ca4b96c835ddfc7366081789b1e
font_01_sfnt_off00015a33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A33 10772 bytes
SHA-256: 467edd450e51991dc89e3fc7fbda286f422f990676351a8c37159b0badc3871f
font_02_sfnt_off00017ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ECF 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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