Malicious PDF — malware analysis report

Static analysis result for SHA-256 769446a185b5e899…

MALICIOUS

PDF

72.2 KB Created: 2020-12-27 12:51:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f024cd40fd040e1eaa019185ae1d4221 SHA-1: 72bc0fa09f698ac7925836e3e1ed6a4134a3fd21 SHA-256: 769446a185b5e899563dd119fc5101c8938dae1f61a7f9fa95db8dfd2da8ec6c
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The presence of external URIs and the overall structure point towards a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafffe.ru/strik?utm_term=gallery+wall+ideas+bedroom PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454306/normal_5fc0924ccb022.pdfIn PDF document text
    • https://cdn.sqhk.co/vikoparif/giYljey/gemukebevepaxiwevuw.pdfIn PDF document text
    • https://ferowadamo.weebly.com/uploads/1/3/4/5/134593689/fobogofoziv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366384/normal_5f8b6d2b276f0.pdfIn PDF document text
    • https://senolotazafam.weebly.com/uploads/1/3/4/5/134597296/jisov-sujifa-lukanifo.pdfIn PDF document text
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/zozomiwidenodipituza.pdfIn PDF document text
    • https://bilobusi.weebly.com/uploads/1/3/4/8/134872308/gofidefiperelu_mobebasinajugej_ranajuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417659/normal_5fe5b5341eea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f9148cb25609.pdfIn PDF document text
    • https://pomisefinare.weebly.com/uploads/1/3/4/9/134902228/6574550.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/fazujo/state_central_limit_theorem.pdfIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/canon_rebel_t6i_manual_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/97593789385.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_off0000ddef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDEF 5336 bytes
SHA-256: 4a915742a64ef6e9cfd3ddc810fbcb35f28484e59827f03d632c3dfa2445a676
font_01_sfnt_off0000f014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF014 10532 bytes
SHA-256: cd7a58bfaa4037c78a5afc5fb5233735f9d8023b601cf20d0fbbe175079111c4

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