Malicious PDF — malware analysis report

Static analysis result for SHA-256 882958765c6195c7…

MALICIOUS

PDF

87.4 KB Created: 2021-03-03 20:51:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 9468d6a083d64169752b332528e706f4 SHA-1: d50372b14aab754e9f5dd0e2138d7a0af48d46ed SHA-256: 882958765c6195c7410c296ecec9d32b35e847e27b5fe14634dd44dbccc56319
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 unrelated or suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://botokaw.ru/strik?utm_term=how+to+start+ariens+compact+22+snowblower PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467955/normal_5ffea2f6c1bda.pdfIn PDF document text
    • https://pewarefat.weebly.com/uploads/1/3/4/3/134361746/5362990.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443619/normal_5fddff7f6886a.pdfIn PDF document text
    • http://zdorovienashevse.xyz/4544900352z9yzt.pdfIn PDF document text
    • http://sujabupinoda.scienceontheweb.net/3674645465.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475874/normal_5fe193302f652.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/waperuxikelevifidijulirjulbo.pdfIn PDF document text
    • http://repair-planshetov.ru/katevakewsvswq.pdfIn PDF document text
    • https://gomamuna.weebly.com/uploads/1/3/5/3/135304292/gomaketoruzimi.pdfIn PDF document text
    • http://republvinb.fun/84351866027mhrax.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467300/normal_600b3a6ed7997.pdfIn PDF document text
    • http://jumpfs.space/offline_battle_royale_games_apk0kn0j.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/palikuvexake/17674589613.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/json_schema_form_builder.pdfIn PDF document text
    • https://s3.amazonaws.com/sogovekevi/59473864587.pdfIn PDF document text
    • https://s3.amazonaws.com/xufaxoferugod/video_editor_android_app_free.pdfIn PDF document text
    • https://s3.amazonaws.com/wokesabisevo/infineon_aurix_tc297_datasheet.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_off000115b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B9 5404 bytes
SHA-256: 4adfeeec97fb9b906ee5a8193265f5e3c0d4317e0adebbd0436ad77f53b4a927
font_01_sfnt_off0001280f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1280F 11728 bytes
SHA-256: ba076e88eccd004742263f8bff9589c73fa159b76ac046932b4eefec3fd1e6a8

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