Malicious PDF — malware analysis report

Static analysis result for SHA-256 07c3b0028bd3cdf5…

MALICIOUS

PDF

72.4 KB Created: 2021-01-13 21:43:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c4f4c5f93e758a6addfe15c5673b98a4 SHA-1: 14228cfe699b2d6488f914fcbaebb9b1f623c943 SHA-256: 07c3b0028bd3cdf56374c79fc9ef959ba6a5f8618fa861404e871605c3ee0bb7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one pointing to 'traffset.ru', a domain flagged for suspicious activity. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://traffset.ru/123?utm_term=bronx+collegiate+academy+graduation+rate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375515/normal_5f8b15a9b24b4.pdfIn PDF document text
    • https://bopelesi.weebly.com/uploads/1/3/0/8/130874615/lutijone_wuxake.pdfIn PDF document text
    • https://site-1185297.mozfiles.com/files/1185297/65337957143.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5feaffe32d63c.pdfIn PDF document text
    • https://vojisijekedix.weebly.com/uploads/1/3/5/3/135311469/xoluxugasawulizof.pdfIn PDF document text
    • https://didaladajede.weebly.com/uploads/1/3/4/5/134524443/aaa9af2a6f4d.pdfIn PDF document text
    • https://cdn.sqhk.co/fumazuri/gjghdjf/bullet_sound_effect_mp3_download.pdfIn PDF document text
    • https://namukizup.weebly.com/uploads/1/3/4/7/134748015/5956333.pdfIn PDF document text
    • https://site-1183491.mozfiles.com/files/1183491/42440690109.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/bajuse/37923662788.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/icivics_worksheet_answers_federalism.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/tofagale.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_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 5300 bytes
SHA-256: fd9a9808707e6b9c230a56a5b23a72c9b45e07579d500128aed359b0dc137627
font_01_sfnt_off0000f072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF072 10628 bytes
SHA-256: 6a9e3c5945023320c833a4eb3b29a18793147202514de316a90d62c7896cb958

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