Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb696ebea281666…

MALICIOUS

PDF

74.0 KB Created: 2021-02-17 13:22:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c82b08369eb2a80a8af368db122fe840 SHA-1: 550b4cac68dfb87200f8d4d1a59a94bff428a980 SHA-256: bcb696ebea2816663794bfbef2ce26084c9c3569c38d5da387ccc6114049df6c
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, appears to contain metadata related to a review, likely a lure to direct users to the malicious URLs. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=beretta+92x+f+compact+review PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491175/normal_60207da0a610a.pdfIn PDF document text
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/todamifizefelo.pdfIn PDF document text
    • https://memuvarava.weebly.com/uploads/1/3/1/3/131384606/b1029.pdfIn PDF document text
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/pugunixowowamodevow.pdfIn PDF document text
    • https://kunudixi.weebly.com/uploads/1/3/4/6/134667289/2494770.pdfIn PDF document text
    • https://lomameleni.weebly.com/uploads/1/3/4/5/134597964/50527.pdfIn PDF document text
    • http://babbieshop.ru/plop_boot_manager_5._0._151x22q.pdfIn PDF document text
    • https://fewojejano.weebly.com/uploads/1/3/4/3/134348079/3f4748.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_601332e7c0668.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386591/normal_5ff0dce97c64a.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/wozokute.pdfIn PDF document text
    • https://jixatazibasuv.weebly.com/uploads/1/3/4/4/134402985/vakir.pdfIn PDF document text
    • https://furiraduwonejos.weebly.com/uploads/1/3/4/8/134870793/luzureg.pdfIn PDF document text
    • https://mivodijabid.weebly.com/uploads/1/3/4/7/134732330/407592.pdfIn PDF document text
    • https://gajevorotaro.weebly.com/uploads/1/3/5/3/135329880/145b88cc8db0658.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413719/normal_601d60f17822d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446942/normal_601629cacca99.pdfIn PDF document text
    • https://zogeliwev.weebly.com/uploads/1/3/4/3/134353139/22ec60bac.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/medaliwifufugel/xanoweduxufojowojidisaman.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_off0000e46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE46A 5508 bytes
SHA-256: a2ad2c764a172321337a4e6e2542704d20e3c5ed800051a61d821ef1c60e86c4
font_01_sfnt_off0000f731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF731 10428 bytes
SHA-256: bcf7880de4279ee18185ff546b98a0ceeca663209ac866fcea0f6ddb388b9ea8