Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66b735dc53be386…

MALICIOUS

PDF

82.4 KB Created: 2021-04-24 08:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 89735837c3b9ceac62c2a5cd58abdec2 SHA-1: e74f185a32841fc3ef13cf0fac654116372ad1a8 SHA-256: e66b735dc53be38616a997e862944f98dac61d76b88d15c32342a020a296e425
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, suggests a lure related to 'Capresso coffee pot instructions', indicating a social engineering tactic to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mezovuduw.ru/strik?utm_term=capresso+coffee+pot+instructions PDF link annotation
    • http://bawazofo.getenjoyment.net/23331563041.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387243/normal_60483cbc65d56.pdfIn PDF document text
    • http://nokasosozigof.mypressonline.com/ignou_assignment_front_page_2020_19.pdfIn PDF document text
    • http://winoorama.site/sheffield_city_hall_seating_plan_viewklpye.pdfIn PDF document text
    • http://xeberok.getenjoyment.net/tesegodivamuruzasuko.pdfIn PDF document text
    • https://cdn.sqhk.co/xetasenuwoji/cZgebjd/empires_and_puzzles_xp_guide.pdfIn PDF document text
    • http://retapadu.medianewsonline.com/bulls_head_repton_menu.pdfIn PDF document text
    • http://nosinoski.shop/remuminopepofuzogadiboftaukc.pdfIn PDF document text
    • http://tryplafond.xyz/10419469552laolz.pdfIn PDF document text
    • http://beririka.scienceontheweb.net/jusiwugerigododumawesuvo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366022/normal_605672849288a.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/QhbEQAu/kegaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404524/normal_60470d082675b.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/70932892908.pdfIn PDF document text
    • https://cdn.sqhk.co/vudararemane/jijxBig/swat_season_2_episode_4_cast.pdfIn PDF document text
    • http://laludinemolat.sportsontheweb.net/jafazaranejukil.pdfIn PDF document text
    • http://fortuneo-enligne.com/catherine_ponderws6ol.pdfIn PDF document text
    • http://shothard.site/united_pentecostal_church_sermonsi8156.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390681/normal_6016b702e860b.pdfIn PDF document text
    • http://limaxinsto.xyz/lagisalesuparuxozuzoziv23q4z.pdfIn PDF document text
    • https://cdn.sqhk.co/resozasevej/icnXDz5/mujogapubotafenesat.pdfIn PDF document text
    • http://lnstagramcentre.net/how_much_does_it_cost_for_a_new_exhaustbt7jf.pdfIn PDF document text
    • http://basidugom.mygamesonline.org/9215519885.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://majezomisi.myartsonline.com/59513785020.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_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 4880 bytes
SHA-256: d98cc83dbd9d8917e84b3c1fa341acfb130407dfa24b3ab90e9a688125c2aaa3
font_01_sfnt_off000112f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F3 12208 bytes
SHA-256: 99bd799d96bd2b134fc285749e7bf3829808ccbd9c403c42d7fe40e480b058e4

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