Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ea3bd1af26d698…

MALICIOUS

PDF

60.7 KB Created: 2021-01-16 14:43:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 31c587f1cd9f0fab9e6ac59c6069e6f8 SHA-1: e72189d1ece20169a6f6280643a721e8be140e53 SHA-256: c0ea3bd1af26d698fa56674ed4a76b36dbc0cea62fb5eae0eb07a03f4f881d0d
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document exhibits characteristics of a phishing lure, specifically prompting the user to install a browser extension or update to view content. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the PDF viewer or the user's trust to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/aws?utm_term=double+platform+bed+canada PDF link annotation
    • https://zewabezasakaru.weebly.com/uploads/1/3/4/5/134593707/1720388.pdfIn PDF document text
    • https://rewemekekebaz.weebly.com/uploads/1/3/1/4/131406535/9536116.pdfIn PDF document text
    • https://sazinuje.weebly.com/uploads/1/3/4/5/134588850/4841db2de.pdfIn PDF document text
    • https://cdn.sqhk.co/dibidoretu/FWC0gdg/capsule_wardrobe_2020_winter.pdfIn PDF document text
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/257421e1.pdfIn PDF document text
    • https://site-1175933.mozfiles.com/files/1175933/todas_las_aperturas_de_ajedrez.pdfIn PDF document text
    • https://tuwijojax.weebly.com/uploads/1/3/4/4/134477229/2470146.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/hgZWzib/police_officer_killed_in_laredo_texas.pdfIn PDF document text
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/pufuniz_wosebubu_gojepivix.pdfIn PDF document text
    • https://site-1171847.mozfiles.com/files/1171847/94059812123.pdfIn PDF document text
    • https://site-1084368.mozfiles.com/files/1084368/ring_doorbell_pro_instruction_manual.pdfIn PDF document text
    • https://degevibuv.weebly.com/uploads/1/3/5/3/135316410/ropijotewuxita-rigekebamapuwo-nuzavasinete.pdfIn PDF document text
    • https://lumidenozure.weebly.com/uploads/1/3/5/3/135345408/3991745.pdfIn PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/3958031.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/zonebon/zifavijisifuketoturutapil.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_off0000b421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB421 5260 bytes
SHA-256: 946395a79a7085626198624e61008e65f83e3cde49beaf3d60f4734564b32b59
font_01_sfnt_off0000c5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F1 9464 bytes
SHA-256: f8ee57cc32dfcdc2930996edea18468ec749cb47229e016fb400f5a265c51d52

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