Malicious PDF — malware analysis report

Static analysis result for SHA-256 d25efb4e8d3bd01a…

MALICIOUS

PDF

76.0 KB Created: 2021-03-14 10:28:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 17a4b1850331affdf3c8b1b18e88187b SHA-1: 749e5bfdfe2759ffe3e0a7a803ad682363dadcfb SHA-256: d25efb4e8d3bd01a7eaebd76b809bb2aec35ee98ed465be05d42bdd5fd99020e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and a heuristic identified it as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a book title, directing users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://soxebez.ru/award?keyword=brian+aldiss+supertoys+last+all+summer+long+pdf PDF link annotation
    • http://natikolom.site/3150538519517a9p.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/mebuje.pdfIn PDF document text
    • http://scoretdho.best/danusodagoganeterarubo86jz.pdfIn PDF document text
    • http://koolmaxt.online/what_caused_the_first_world_war_2puxli.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/mumakaxukatibawofow.pdfIn PDF document text
    • http://bepifukikuku.mygamesonline.org/pdf_file_compressor_software.pdfIn PDF document text
    • http://siwarezowagi.iblogger.org/piece_of_information_crossword_clue.pdfIn PDF document text
    • http://kefets.xyz/neurological_assessment_nursing_procedurezo7gi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tinejamuwaki.epizy.com/football_news_app.pdfIn PDF document text
    • http://dujebutunerov.rf.gd/design_patterns_explained_shalloway.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_89313d356dee406fa20152ca72802cc2.pdf?index=trueIn PDF document text
    • https://5d9de69b-f80b-44d6-9c2d-9027806fef0b.filesusr.com/ugd/e26ad2_36815da71c604d9d8dc8fd438c82bd3c.pdf?index=trueIn PDF document text
    • http://puxajominasunat.epizy.com/august_telugu_calendar_2020.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_af0b0178563d44a583d57fc483db137f.pdf?index=trueIn PDF document text
    • http://nalosig.rf.gd/pijodefokusugigo.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/paleo_diet_for_athletes_meal_plan.pdfIn PDF document text
    • http://wizigipixe.atwebpages.com/pijenevupami.pdfIn PDF document text
    • https://c81c1a69-aec6-471c-ac34-7a6800eafc69.filesusr.com/ugd/9ef1ea_6e25302d9e4f467db91544e49efe7c18.pdf?index=trueIn PDF document text
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_ad6e3f02391a4a53b8b2998ec6630c4c.pdf?index=trueIn 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_off0000ed9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9E 5512 bytes
SHA-256: 72f84a9b24c0e632644d12a76d3e7d11c5be1331d1940110cf40972de7d7523c
font_01_sfnt_off00010052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10052 10340 bytes
SHA-256: 98c99056fdae043fb6c629b07262ba7af786c428285f5d8a36bdf5b955ad8d9c

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