Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f002deb9e616c0…

MALICIOUS

PDF

69.6 KB Created: 2021-02-21 11:50:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 9df88ca6bd24ecbfb5396125459d09cf SHA-1: f01f9a3577b0d0716682e26c656395487c537535 SHA-256: 91f002deb9e616c0d2c4e383ad1a2f8aec22fb76ba1f5d22a345c15f30bd4777
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with a significant number pointing to disposable hosting and potentially acting as a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this behavior. While no scripts were extracted, the presence of many URLs and the link farm heuristic point towards a phishing or content-luring 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://leonvi.ru/wix?keyword=san+diego+regional+standard+drawings PDF link annotation
    • https://wuvotawek.weebly.com/uploads/1/3/4/8/134872633/xulipig.pdfIn PDF document text
    • https://jajibesuwazigix.weebly.com/uploads/1/3/1/3/131383486/9586331.pdfIn PDF document text
    • http://kafixerutatad.iblogger.org/weekly_menu_planner_excel_template.pdfIn PDF document text
    • http://scrlt.xyz/family_farm_seaside_cheat_apkit2th.pdfIn PDF document text
    • http://1xbet-football.fun/kagajexx4du.pdfIn PDF document text
    • http://rufisurerupu.iblogger.org/mujudipujo.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/wubazesinuzo.pdfIn PDF document text
    • http://prodson.space/785170205089m91o.pdfIn PDF document text
    • http://povar2020.site/61750580492trfoz.pdfIn PDF document text
    • https://bitojobuf.weebly.com/uploads/1/3/4/8/134892495/3257144.pdfIn PDF document text
    • http://titanof-filtr.ru/abdominal_pain_during_pregnancykvhxo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezuzatutuxi.epizy.com/learnzillion_guidebooks_ela.pdfIn PDF document text
    • http://sefeluxezilire.epizy.com/luxaripekazabatasebur.pdfIn PDF document text
    • http://janofegiwene.epizy.com/18440812256.pdfIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/fesuboxireputene.pdfIn PDF document text
    • https://s3.amazonaws.com/regegozumekoza/icao_annex_17_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xujitezu/zumunadim.pdfIn PDF document text
    • http://nisuzadusidu.epizy.com/chef_hat_template.pdfIn PDF document text
    • https://s3.amazonaws.com/ditiruz/supply-_side_platform_defined.pdfIn PDF document text
    • http://foperibonar.rf.gd/lands_end_catalog.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_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 5188 bytes
SHA-256: 0339472db2dd13931a8b9a4ad4dd9e3963594083669d460de7ba9d51b1635252
font_01_sfnt_off0000e596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE596 10260 bytes
SHA-256: bf2ccdc3a5faf457ddc81bff71eb6ca3d0ee044be41b5789b5bda310ff30faa7

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