Malicious PDF — malware analysis report

Static analysis result for SHA-256 85635f04c6ec52b5…

MALICIOUS

PDF

75.4 KB Created: 2021-01-17 03:14:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 591934292743fe277591a42554b745b1 SHA-1: d8d62d3cfd32c914d310d6713bd58c783e74edfc SHA-256: 85635f04c6ec52b5e953f0e48fd1db8dcd9d2ad46897ef85415b34731a9abc28
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan distribution attempt. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The primary purpose appears to be directing users to a vast collection of other PDF files, potentially to host further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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 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://trafffi.ru/123?utm_term=google+dictionary+extension
    • https://site-1167978.mozfiles.com/files/1167978/ribewojezekome.pdf
    • https://static.s123-cdn-static.com/uploads/4368226/normal_5ff27b5ded719.pdf
    • https://site-1168441.mozfiles.com/files/1168441/daffynition_decoder_answer_key_warehouse_and_explain.pdf
    • https://rosokejasos.weebly.com/uploads/1/3/1/8/131871530/dokinevitulupom_zemupivajox_niretiterax.pdf
    • https://site-1246235.mozfiles.com/files/1246235/73405474707.pdf
    • https://domemasajexal.weebly.com/uploads/1/3/5/3/135304114/4157363.pdf
    • https://legawugo.weebly.com/uploads/1/3/4/5/134509979/gugawujokaj.pdf
    • https://sanokigoj.weebly.com/uploads/1/3/4/8/134863934/e9db27c339837b.pdf
    • https://nixawajumumija.weebly.com/uploads/1/3/4/3/134338940/4520443.pdf
    • https://site-1175027.mozfiles.com/files/1175027/lezoxeneruxade.pdf
    • https://site-1243885.mozfiles.com/files/1243885/65630045219.pdf
    • https://jokuvaput.weebly.com/uploads/1/3/4/5/134589987/gofunepijexixi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea0d.bin
990100351d8d2d35e5f0ed5c8ec0b2a0d649b7a9142f403e54538796ff7f58f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0D 5308 bytes
font_01_sfnt_off0000fc3b.bin
5f5588f101ef6030e1ae8a45af7a636708f5807033986b8f32f356e6281f3ebb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10804 bytes

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