Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9d6af2a5ed2e976…

MALICIOUS

PDF

74.4 KB Created: 2021-03-01 12:23:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: abcd734ba8bf57ced8da12fc19ee5e1e SHA-1: 221a2923cc4894bb6d13bd47a34cfa933f1b4cf6 SHA-256: d9d6af2a5ed2e9766f45686d0634c27bc0b3f0ac04239202d8d93d92336396d7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to free software, indicating a lure to entice users to click on the malicious links.

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://baarspo.ru/123?utm_term=is+microsoft+flight+simulator+free+on+game+pass PDF link annotation
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/kixane_gurejabibuje_tajin.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/8978777.pdfIn PDF document text
    • https://putusura.weebly.com/uploads/1/3/1/6/131606782/lafabijilikem-firebopatudegin-manewugaxox.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446152/normal_5ff8adcd03356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481699/normal_5fe93749f0fa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408174/normal_5fc84e425e1ed.pdfIn PDF document text
    • https://musisemikalig.weebly.com/uploads/1/3/4/6/134694348/koduvegadawakani.pdfIn PDF document text
    • https://gupapuna.weebly.com/uploads/1/3/4/7/134726568/wezafodi.pdfIn PDF document text
    • https://femowoziso.weebly.com/uploads/1/3/1/3/131398515/punal.pdfIn PDF document text
    • https://kusigalodedi.weebly.com/uploads/1/3/5/9/135965864/mujopedemetikabomo.pdfIn PDF document text
    • https://vogapixafaroge.weebly.com/uploads/1/3/4/2/134234717/5070083.pdfIn PDF document text
    • https://koxawikala.weebly.com/uploads/1/3/4/6/134643159/sugirizereka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visobiwedixupip.rf.gd/florence_tv_reporter.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_off0000e692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE692 5368 bytes
SHA-256: 5b7944fe636a050614e2d0ed330cc92827336257b3c4934bf56f91d21d044fa8
font_01_sfnt_off0000f8aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AA 10540 bytes
SHA-256: 1b14cf678452b17e8bcacbd9b96cc701611fa32a09017530fb19d5c64afffec5

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