Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1612141e1cbb89f…

MALICIOUS

PDF

74.3 KB Created: 2021-02-15 13:01:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a54561582fed10c54928cb8c6cc33945 SHA-1: 5c8e74347fd719749853616f21fc6c4d94f48a9c SHA-256: c1612141e1cbb89ff217c2c30c83d6e6c356bddc7c8ae8fce6996b76442f4e5e
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/strik?utm_term=xerox+wc+7845+toner PDF link annotation
    • https://cdn.sqhk.co/botonerepap/j3ic2pl/evoland_2_walkthrough.pdfIn PDF document text
    • http://fitness-ital.fun/lekelezexojaxonag0p3mk.pdfIn PDF document text
    • https://cdn.sqhk.co/gefimiwotux/gjbhijc/sulebexuwinofutovelegotus.pdfIn PDF document text
    • https://cdn.sqhk.co/wujakegu/Chgbij1/74824150937.pdfIn PDF document text
    • https://cdn.sqhk.co/govazofaj/iSii6nu/stuntman_ignition_pc_game_free_download.pdfIn PDF document text
    • https://sekagerufelijet.weebly.com/uploads/1/3/5/9/135965199/budoxof.pdfIn PDF document text
    • http://timecodes.net/module_6._1_leaping_lizards_answer_keyqy2gb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vavogave.rf.gd/51189471041.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/fexowavaseg.pdfIn PDF document text
    • http://vuropomap.epizy.com/pure_imagination_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/litunux/kejakekozu.pdfIn PDF document text
    • http://katujomun.rf.gd/76628558942.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/cell_and_battery_mcq.pdfIn PDF document text
    • http://zitamekoliliwe.rf.gd/76604719515.pdfIn PDF document text
    • http://vizawog.epizy.com/bangkok_mobile_number_format.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD766 4736 bytes
SHA-256: d4024a36f76cb7017bb2fc46c67b2d9f175c407271f3f0e24912cb2e8517d556
font_01_sfnt_off0000e7ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AB 11420 bytes
SHA-256: 8ad726b342a7a45b08de5ad4e90f378e70daa5c59d193810f07c2fd7a21a9d89
font_02_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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