Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71cd064e44e2b73…

MALICIOUS

PDF

75.4 KB Created: 2021-02-24 20:37:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: b2cf29769026fab55ed31dae68451043 SHA-1: 202c01d736f586af4e92e64c0001953d740f7ff3 SHA-256: d71cd064e44e2b73a781610d7ca45a7bde1d71ed9f8798dd79a9fbd01aab6b92
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

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://maypoin.ru/wix?keyword=information+security+architecture+framework PDF link annotation
    • https://cdn.sqhk.co/dexijonur/VgcUIjh/kodi_xanax_build_buffering.pdfIn PDF document text
    • https://cdn.sqhk.co/pabefidinaz/jiieshe/lulenafuma.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/56703022625.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/graphic_design_pricing_list_malaysia.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/IFckjbX/jomewomivaxivekizegila.pdfIn PDF document text
    • http://kolomata.ru/nepiwikirakoloxutun683qb.pdfIn PDF document text
    • http://rolapisi.scienceontheweb.net/dobiwefase.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/cjg3ijt/idle_arks_build_at_sea_apkpure.pdfIn PDF document text
    • https://cdn.sqhk.co/towafeniruje/WgdDhh4/george_strait_song_lyrics_cross_my_heart.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/g7ijDhf/royal_caribbean_cruises_2021_caribbean.pdfIn PDF document text
    • http://rowowevu.mypressonline.com/labuzizati.pdfIn PDF document text
    • http://honey-love.ru/bubeboneptrkx6.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/what_time_does_the_stock_market_open_my_time.pdfIn PDF document text
    • https://cdn.sqhk.co/tosuwukiwate/LgeOg8f/3287962155.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/what_is_a_normative_ethical_question.pdfIn PDF document text
    • http://megalit-korolev.ru/57755932871r9nc2.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/7gfjh01/cat_talking_cat_virtual_pet_games.pdfIn PDF document text
    • http://cparta.moscow/gumabiwepakemebezap0klz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litorow.myartsonline.com/simple_russian_grammar.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_off0000ea8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8F 5284 bytes
SHA-256: e3af30263de744c64d43ad0c9c2611b25f3b6863c2a4794fc70df9a04aa39189
font_01_sfnt_off0000fc73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC73 10484 bytes
SHA-256: 662d774d0f2e929071bd5e7bfdb2a7af37a60ae2e8e2e587187f12cb67518ee3

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