Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bdd8423f9f8379…

MALICIOUS

PDF

78.7 KB Created: 2021-03-14 02:30:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d3ad1ad28c621d99c9823a29a613873c SHA-1: 22eb46ba1544cad3904b68a52eff95b55bba063f SHA-256: a6bdd8423f9f837991d09d6f1f5c6fab87cb1da83e382cb273f34ed98d4eedf3
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the PDF structure itself is indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=best+app+for+studying+the+bible PDF link annotation
    • https://pezawixutumef.weebly.com/uploads/1/3/1/1/131164564/742219.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/zivupotinonomev.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/4305560.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/iig9jg2/nhl_21_player_ratings_islanders.pdfIn PDF document text
    • http://kugaraginoja.mypressonline.com/tracing_letters_free.pdfIn PDF document text
    • http://xuvepawa.iblogger.org/99352670376.pdfIn PDF document text
    • https://cdn.sqhk.co/porosobof/hchcoJg/pokemon_go_plus_bracelet_amazon.pdfIn PDF document text
    • https://vokewubepil.weebly.com/uploads/1/3/4/4/134443825/lovubasezelusi.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://xolavozezimodan.onlinewebshop.net/lycoming_o-320_owners_manual.pdfIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_7514ae3d3e35460fa156d3a7577ededa.pdf?index=trueIn PDF document text
    • http://duwemanuwixam.atwebpages.com/varicela_neonatal_tratamiento.pdfIn PDF document text
    • https://ebbb41b5-b8b7-4bfc-9e1b-23e79ad93844.filesusr.com/ugd/5eba67_1c9604f915e04d05b064305cbb6f6ba7.pdf?index=trueIn PDF document text
    • http://dizakopalelur.epizy.com/sekiro_purification_ending_guide.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_off0000e702.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE702 5476 bytes
SHA-256: 3e579afbd07a614c8c82c4ade9fb5b1f1d7748e69401fae382047c70b62b185b
font_01_sfnt_off0000f99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99A 11124 bytes
SHA-256: c543e86e48a0cd582efa7f39d87919fb2326cde5e9fc02cec5fb37ac0c70256e
font_02_sfnt_off00011f4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4D 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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