Malicious PDF — malware analysis report

Static analysis result for SHA-256 cab33461531c531c…

MALICIOUS

PDF

71.2 KB Created: 2021-02-19 16:07:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 37fc7ddff75058c10dc83cc3337df23f SHA-1: d7342b725ac18cc70844ecf941c0ee9fac9cdbc3 SHA-256: cab33461531c531ce98a81f01638c005189b914fe16c6dd60a809848cbbf037d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with many pointing to disposable domains and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are sufficient to infer a malicious attack pattern.

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 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://jottigo.ru/123?utm_term=pokemon+books+free+pdf PDF link annotation
    • http://opticsystem.website/chores_planner_template7p0ip.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/fjcdgjp/titan_quest_ragnarok_best_mage_build.pdfIn PDF document text
    • http://studytogether.fun/mubitivajn251.pdfIn PDF document text
    • http://madewithsunshine.com/worasuzewobojupusizamigo0qx.pdfIn PDF document text
    • http://godubumoze.iblogger.org/99720740761.pdfIn PDF document text
    • https://cdn.sqhk.co/janonaset/SyieRZ0/zixubamixivopukaxasedakol.pdfIn PDF document text
    • http://trastqort.online/ancient_history_ncert_class_12_in_hindii7en6.pdfIn PDF document text
    • https://cdn.sqhk.co/jepogedofuz/Wiegggi/outbreak_perfected_catalyst_siva_particulate_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446285/normal_5ffadb84bd64d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375088/normal_5fe544cfd8845.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://kakarares.epizy.com/zawuxoxizebasor.pdfIn PDF document text
    • http://bizosubage.rf.gd/ethical_considerations_in_research_proposal_template.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/tnis_converse_all_star_plataforma_branco_couro.pdfIn PDF document text
    • http://guruwemuzotal.epizy.com/76641626140.pdfIn PDF document text
    • http://kenamumiv.rf.gd/diramidopodegelumiko.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_off0000cd50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD50 4812 bytes
SHA-256: 9cf98e4eb2c6811c14974f09df8c4ad4854ef77cacbc30ef71e42a99825869b7
font_01_sfnt_off0000dd76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD76 10944 bytes
SHA-256: 6a80efddf140b9e05e89e42758d6201605cba210e56f7aa0d5b5dcace67c8b24
font_02_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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