Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e50e9159a99e30…

MALICIOUS

PDF

68.5 KB Created: 2020-12-27 08:22:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f41a534b6dde1e4017041e36b23b2b89 SHA-1: 593f0dd4f880918eeeede8a9ca08254a02e24d28 SHA-256: a1e50e9159a99e304035da00b233ae2fbbda418b4714736a9da9548cd84919ba
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to Weebly-hosted PDF files, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://traffine.ru/strik?utm_term=traffic+rider+games
    • https://vilifamizebu.weebly.com/uploads/1/3/4/6/134617150/wotiki.pdf
    • https://sarutofujatazix.weebly.com/uploads/1/3/4/5/134584212/9003241.pdf
    • https://jopalezaleloloj.weebly.com/uploads/1/3/1/3/131380469/jagazo-xogusixenisokog-xeliwoxaf-jokufuwi.pdf
    • https://cdn.sqhk.co/boxokozofe/bieibf3/colors_that_go_together_clothes.pdf
    • https://cdn.sqhk.co/wewuxujudu/jgYZxie/directv_customer_service_email.pdf
    • https://disavapiviloma.weebly.com/uploads/1/3/4/3/134351159/95ca0c4f.pdf
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5f88d31276999.pdf
    • https://cdn.sqhk.co/masamiwe/ibFMgjd/download_game_candy_fever_mod_apk.pdf
    • https://cdn.sqhk.co/xuwisagilevi/Ajejdgg/less_screen_time_with_apple_watch.pdf
    • https://cdn-cms.f-static.net/uploads/4394073/normal_5f96478b785f0.pdf
    • https://pulezigo.weebly.com/uploads/1/3/4/6/134600697/3686318.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/varolexexus/65139331277.pdf
    • https://s3.amazonaws.com/nevovumowa/android_tv_google_play_services_has_stopped.pdf
    • 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_off0000d1b4.bin
a1bae378d16441b8e4e967f04a9d10c390fefd47bb638e1841fe6e524332aa8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD1B4 5260 bytes
font_01_sfnt_off0000e380.bin
938f0e9c95a496d148fa0feda7427ae3dab1cc1a941bf16e74d2f715c82251e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE380 10028 bytes