Malicious PDF — malware analysis report

Static analysis result for SHA-256 32a77c1614398a98…

MALICIOUS

PDF

64.3 KB Created: 2020-11-30 17:51:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e2207fbf4b1319916be5c11adadb8374 SHA-1: 3c534cf6b9289d7c7af75b523cebb687fed028d3 SHA-256: 32a77c1614398a985a79eb10bbc83e11d2467709c8abc4a0bb2e3e8c5360ad72
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm with numerous external URLs, many hosted on disposable domains, indicating a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent. The embedded URLs are likely used to redirect users to malicious sites or download further payloads.

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.
  • 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=limiting+reactant+and+percent+yield+practice+answers PDF link annotation
    • https://zifuxiwow.weebly.com/uploads/1/3/3/9/133997311/c9c459.pdfIn PDF document text
    • https://lafapimiwegu.weebly.com/uploads/1/3/4/0/134041150/pilitugijojepebesux.pdfIn PDF document text
    • https://ziwavolenexajid.weebly.com/uploads/1/3/4/5/134503628/benoz.pdfIn PDF document text
    • https://pisolapep.weebly.com/uploads/1/3/4/6/134648883/3ade8aa.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/4c7a982dfa3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f8c5fc868ef6.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/739bdf.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/takateg/disney_u.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e47a908f-dc2a-4fe1-9cbe-1c7cdf69eda5/61022438639.pdfIn PDF document text
    • https://s3.amazonaws.com/biwuwukesazef/sejeg.pdfIn PDF document text
    • https://s3.amazonaws.com/dakebesuvum/bestwap._in_video_2018.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_off0000bd5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD5F 5528 bytes
SHA-256: 546f764644fa521dae6c611eac693b953beca6bc9e6bf1d705873bb2b2a40a72
font_01_sfnt_off0000d02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD02D 10600 bytes
SHA-256: de3291500d599a637cdfeab210c799fb6655361ae10f6fe582cb159df6d2e6a3

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