Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b31dc80fd3896d9…

MALICIOUS

PDF

79.4 KB Created: 2021-02-24 01:53:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 70e9c8d1841def2f06e205738d91aedd SHA-1: e9b72f54685756709735b3e3bc56fa8a94214b4b SHA-256: 3b31dc80fd3896d90ac52835ca2c5383d1b7929718a69daf1a8d4fb16932c979
126 Risk Score

Malware Insights

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

The PDF contains multiple external URLs, with one identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards a downloader or phishing lure.

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://jacksth.ru/wix?keyword=burnout+paradise+remastered+achievement+guide+and+roadmap PDF link annotation
    • http://idealslimitalia-oficial.site/42989959189j17ec.pdfIn PDF document text
    • https://cdn.sqhk.co/kurutuxerodi/kPhdngi/91600403637.pdfIn PDF document text
    • http://probnik1313.tech/2005_nissan_frontier_catalytic_converter_bank_1ybp4v.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/ieVjbhf/youtube_instant_pot_recipes_hard_boiled_eggs.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447079/normal_601bc88954fb7.pdfIn PDF document text
    • http://websporizle3.com/vidufexobidenuzofonesebofdj.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/iecoDif/positive_snowball_effect_definition_psychology.pdfIn PDF document text
    • http://boost-store.net/lepomalijegebapuxuneko4a093.pdfIn PDF document text
    • http://expressvpn.store/cyberpower_cp1500pfclcd_pfc_sinewave_ups_reviewzh462.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xadebomuf.rf.gd/bloody_mary_hollywood_movie_tamil_dubbed.pdfIn PDF document text
    • http://xoxadexol.rf.gd/african_queen_by_blackface.pdfIn PDF document text
    • http://ralemagafi.epizy.com/83065101207.pdfIn PDF document text
    • http://jodonurinifos.epizy.com/93801286171.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/59354616143.pdfIn PDF document text
    • https://s3.amazonaws.com/jalasilunaz/25612426648.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/93566577165.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_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 5564 bytes
SHA-256: 4c57adf8a0d2a879388c4801de297f99eb439aa8663221ef3cae513bbc393b43
font_01_sfnt_off00010cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDB 10208 bytes
SHA-256: 52fa649af5bfb59ee766fef7fa9da3584599fd6bed90a625c7782b0c88c06917

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