Malicious PDF — malware analysis report

Static analysis result for SHA-256 d351b8194af91f21…

MALICIOUS

PDF

82.4 KB Created: 2021-03-12 17:04:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: efe03e2c10f446b9cc9a957febe266fd SHA-1: f9104b08c3fef3585555521d1e6dae99bbc982a2 SHA-256: d351b8194af91f211510025dcaea909e99c23739daf92a48355b7c398b5fd048
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 external URIs, many hosted on disposable domains, indicating a link farm designed to redirect users. The PDF's structure and embedded URLs suggest it's part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/strik?utm_term=dinamicas+grupales+de+integraci%25C3%25B3n+para+adultos PDF link annotation
    • http://tixesikixux.mygamesonline.org/92175096922.pdfIn PDF document text
    • http://nosilekexiwot.mywebcommunity.org/us_stock_market_closed_today.pdfIn PDF document text
    • http://afracheat4.xyz/enlisted_auctions_appgpzba.pdfIn PDF document text
    • http://bas-vorota.ru/rililujofakilemfr7d7.pdfIn PDF document text
    • http://copyright-infringement.business/659145174rfqaz.pdfIn PDF document text
    • http://consumer-data-protection-bureau.com/jazz_piano_scales_and_modeslgriy.pdfIn PDF document text
    • http://ppl-nutrshopfit.website/43140389635w5fmb.pdfIn PDF document text
    • http://esclub.pro/hp_officejet_pro_8600_turn_off_double_sided_printinga3jwv.pdfIn PDF document text
    • http://denizan.com/azkoyen_vitro_s5_manualrufri.pdfIn PDF document text
    • http://noverst.xyz/62192802155d6q0y.pdfIn PDF document text
    • http://garderob-podolsk.ru/26677190113h45gj.pdfIn PDF document text
    • http://theplafond.xyz/what_does_killing_a_spider_in_your_dream_mean78qp9.pdfIn PDF document text
    • http://biomaniix.website/raju_bhai_movie_hd_video_songsw6seo.pdfIn PDF document text
    • http://tufodudem.mypressonline.com/is_dynamic_tension_good_for_building_muscle.pdfIn PDF document text
    • http://wojesukuzak.mygamesonline.org/logiciel_fusion_gratuit_mac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_916b0932245e44a193c1db93de20cc80.pdf?index=trueIn PDF document text
    • http://riveminigokoxa.myartsonline.com/13200228601.pdfIn PDF document text
    • https://bdee3e82-1fe6-4084-b289-f15f5249f83e.filesusr.com/ugd/749937_9be577cb91e5478fa4f818bc5d3838a7.pdf?index=trueIn PDF document text
    • https://e1cf253b-b3af-4135-a675-1c3c021177f9.filesusr.com/ugd/111c46_bd68130d54334e21b48c85fb27e49bd2.pdf?index=trueIn PDF document text
    • http://josesomesube.myartsonline.com/lobewitunexigokofopir.pdfIn PDF document text
    • https://5c09c65f-4728-49e3-9562-8692e696fc4f.filesusr.com/ugd/32acb1_275ca899d23d4e3ea3f51f1ad5dd4fc9.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_off000100ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CA 5528 bytes
SHA-256: 0047cb786c043b49eaa0c2a5c2072b2ed16425c94d79e418691f6904171e3a13
font_01_sfnt_off00011345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11345 11996 bytes
SHA-256: ba50bc188713fb5f4afc9f84f585272a22c8300ee17bb8e2f1c4b85080828180

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