Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89c27ae641fedab…

MALICIOUS

PDF

65.8 KB Created: 2020-11-24 10:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ec3bfda80491b8036f75fa6b859c29d9 SHA-1: 10641caa371def1a522cb8dcf208cf400c913ff4 SHA-256: f89c27ae641fedab795263dd5e7706e43a2319be3db014e016e7fc460528e562
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple unknown URLs and the 'PDF_SEO_LINK_FARM' heuristic confirm the document's purpose is to funnel traffic to external sites.

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://traffking.ru/123?utm_term=mengqi+ji+joe+elledge PDF link annotation
    • https://kobisizosupo.weebly.com/uploads/1/3/4/3/134316778/5863007.pdfIn PDF document text
    • https://makonajarozov.weebly.com/uploads/1/3/4/3/134341931/8912210.pdfIn PDF document text
    • https://dafuzimobolu.weebly.com/uploads/1/3/4/4/134498283/gesufekaso.pdfIn PDF document text
    • https://buliduxefexefux.weebly.com/uploads/1/3/1/6/131636978/7527009.pdfIn PDF document text
    • https://pipumemudif.weebly.com/uploads/1/3/4/8/134866913/debugiritobimeg-sefavumoji.pdfIn PDF document text
    • https://lumifuwuzuzeb.weebly.com/uploads/1/3/4/6/134698668/7979902.pdfIn PDF document text
    • https://bipakevulof.weebly.com/uploads/1/3/4/6/134602937/6175693.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/994cb014-14d6-4e69-b423-f413815d46a3/78786717568.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a83a9953-3431-4b00-a303-c73da5dd5288/20497310079.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/248ea3e5-c6d9-4111-a8e5-02a255d57357/kitogezibusovisifuz.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/25092190429.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_off0000c653.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC653 4716 bytes
SHA-256: c9beda2d6ce8bfb1b290809b7886951a4abb15fff59527acff0b5b044f819bc7
font_01_sfnt_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 10732 bytes
SHA-256: b1fe47309cc6a709874e722710a59dd3b3bfdb38d38a6565c939088b14e111fa

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