Malicious PDF — malware analysis report

Static analysis result for SHA-256 14a792c4a2eea68c…

MALICIOUS

PDF

119.6 KB Created: 2021-01-01 04:07:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5e59d3bcc92710dc972cf5050353dc10 SHA-1: 5df0a97490b0afd6b5ef0ee50fdc8bdf2462e1f5 SHA-256: 14a792c4a2eea68c10c7f7415a023d8eb2635d7f16c7c08ef3102c6fe40d44d6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other free hosting services, suggesting a link farm or SEO manipulation tactic. ClamAV and ML classifiers indicate malicious intent, specifically classifying it as a phishing trojan. The embedded URLs likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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 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.
  • 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://traffnew.ru/123?utm_term=patterns+and+mechanisms+of+evolution PDF link annotation
    • https://bizavurodetilu.weebly.com/uploads/1/3/4/3/134391156/sirepopap.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/7jfCJZr/nokisaxofebaletevovasanoz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413578/normal_5fe26525ad0c8.pdfIn PDF document text
    • https://tiforunu.weebly.com/uploads/1/3/1/4/131437018/peruduxufepu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455886/normal_5fcaad5a17ce4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490738/normal_5fb97b02c0883.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454982/normal_5feb19172d1d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403422/normal_5fd9bdadd2a68.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/tosevud/cis_trans_isomers_triple_bond.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/66794326797.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/saxofege.pdfIn PDF document text
    • https://s3.amazonaws.com/naxozelozude/mixed_present_tenses_exercises_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2e4c248-c24c-4215-8105-125f3261e049/derivatives_worksheet_with_solutions.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_off00019502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19502 5324 bytes
SHA-256: 9a5d5cb7da17ecd743d209faaaeef5e907d87cc408f0548f974f3f90e3837cf9
font_01_sfnt_off0001a6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6FB 12540 bytes
SHA-256: fb1a4f5dfc1fd30898b41f0710bc9b4e8990387d4537ee1d9f798ae3886603ad

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