Malicious PDF — malware analysis report

Static analysis result for SHA-256 78bd487b6d109e52…

MALICIOUS

PDF

75.7 KB Created: 2021-01-05 11:26:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a11818900dac96e78000ebf37ef6e38b SHA-1: 9c81a9572f0217c54732eeede08057026b1fdddc SHA-256: 78bd487b6d109e52934f0d65175424b66edaa97bc0b006c10ad7f5003b9b02a6
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a phishing threat. It contains a large number of external links, suggesting an attempt to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate a likely phishing or link-farming attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/123?utm_term=physioex+9.0+exercise+7+activity+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412165/normal_5fd9d377d8c89.pdfIn PDF document text
    • https://rudanivaxaf.weebly.com/uploads/1/3/4/4/134497940/puruzavotowatup_kutuzebubefapog_madasupovasagid_sopowuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370064/normal_5f98a841469fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_5f98c8f09aa58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408195/normal_5fea26d239417.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_5f976c5e49cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384655/normal_5f992918d47e8.pdfIn PDF document text
    • https://cdn.sqhk.co/jukusenefow/ghghjph/panitefapafagufogevujak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7ea163-ff27-441b-a3e0-f28a7831e142/barrons_essays_that_will_get_you_into_medical_school.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/easy_fire_tools_app.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/69357038364.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_off0000e8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C9 5628 bytes
SHA-256: 38648a8bb2ee60af384214f9e11a5725f53b6174a8667a4878ff0d9c399829ef
font_01_sfnt_off0000fc01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC01 11812 bytes
SHA-256: 84762d0962f17fe9a7447454109309ace40fa04e1995acde0ae9471c152b798f

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