Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca3541d4ef0660e…

MALICIOUS

PDF

69.4 KB Created: 2021-02-17 12:47:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 2b973c98ce9255e8ad7c9e9c66af66d6 SHA-1: d5e860c942f1047c8674fa854fb7a96e5a4d2a87 SHA-256: 0ca3541d4ef0660e407fa9870eb2e0037a00c1ea5bd8df582e8aa4c8e23c726e
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains and Weebly-hosted files, indicative of a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the heuristic firings for PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM confirm the nature of the document as a lure to external malicious content.

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://seumenha.ru/strik?utm_term=husqvarna+leaf+blower+parts+at+lowes PDF link annotation
    • http://linza.media/gimazezevewutibuberivagcdh.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/KwiaU9r/rozijiniwime.pdfIn PDF document text
    • https://cdn.sqhk.co/vivepovugeli/dqghohc/valusozazekove.pdfIn PDF document text
    • https://cdn.sqhk.co/xagaxubibiz/cW9jiiZ/49563885297.pdfIn PDF document text
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/06a484f6853.pdfIn PDF document text
    • http://static-get.top/755622027244dynl.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/iThApmZ/tewenojopu.pdfIn PDF document text
    • http://menbp.online/video_player_download_for_windows3mw4j.pdfIn PDF document text
    • https://xonadenot.weebly.com/uploads/1/3/4/6/134685596/1787154.pdfIn PDF document text
    • https://wejitefokok.weebly.com/uploads/1/3/1/1/131164199/66ea62ab.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/tovaj_legoj_gisogagi.pdfIn PDF document text
    • https://golewobewawir.weebly.com/uploads/1/3/4/3/134350879/c1369cc90b2a56.pdfIn PDF document text
    • https://labelamujevodit.weebly.com/uploads/1/3/1/6/131606697/repisoxawitar.pdfIn PDF document text
    • https://sitofozaliwi.weebly.com/uploads/1/3/4/3/134355749/a3cd6f6cae01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kegotetebam.epizy.com/60522057566.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_off0000d1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FA 5276 bytes
SHA-256: 5488a639f5a39ca6c137f490bac38fbeb7cb1a2a87c7bad2fcbff31b1f6400dc
font_01_sfnt_off0000e40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40C 10756 bytes
SHA-256: 158a3fef298b08c346684948f557b638cbba5ba0ce61679147a7f1d65378282a

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