Malicious PDF — malware analysis report

Static analysis result for SHA-256 91a36981f9091102…

MALICIOUS

PDF

76.5 KB Created: 2021-04-07 08:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 424a66b084f37d058487ea2988f67dfa SHA-1: ba042d86fbc0bcfae98218b045700864509ec1a3 SHA-256: 91a36981f90911029a7b59a5a9abb00511992a30749ab6cf8fdec42ce92715fa
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, with at least one pointing to a suspicious domain ('golowaki.ru') that appears to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=hamilton+beach+digital+air+fryer+toaster+oven+manual PDF link annotation
    • http://nibewubixela.getenjoyment.net/sor_callista_roy_biografia.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/uKNwged/runescape_grand_exchange_bond.pdfIn PDF document text
    • https://cdn.sqhk.co/nazamesuwute/bihZhek/52033654863.pdfIn PDF document text
    • http://ladekepevij.mygamesonline.org/51064398153.pdfIn PDF document text
    • http://nakalabaxis.mywebcommunity.org/bifironojebovepupomigal.pdfIn PDF document text
    • http://vakosaditozig.22web.org/38276915599.pdfIn PDF document text
    • http://tezuveripoxub.mypressonline.com/algebra_textbook_mcdougal_littell.pdfIn PDF document text
    • http://memisada.mygamesonline.org/procedimento_cautelare_uniforme.pdfIn PDF document text
    • https://cdn.sqhk.co/posojuvapono/kBihcgi/sediwizusawuse.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/hd8jjgi/my_sprint_rewards_me_login.pdfIn PDF document text
    • https://cdn.sqhk.co/rapigufagi/pXS7Mge/61517982930.pdfIn PDF document text
    • http://lozejebivo.scienceontheweb.net/wezelaxetaxolat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_81fd93b0d6d54379a8cbc21e99327cb7.pdf?index=trueIn PDF document text
    • http://movuzawizigevej.myartsonline.com/centrelink_rent_certificate_form_download.pdfIn PDF document text
    • http://guwoxidewoje.epizy.com/public_health_act_and_policies_in_zambia.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/advertising_strategy.pdfIn PDF document text
    • https://332892e0-6a2b-40ad-946e-e7c92c61c867.filesusr.com/ugd/3e5d97_a7a03b1194d347a29bed499b3c0c092e.pdf?index=trueIn PDF document text
    • http://zipemoluligera.myartsonline.com/lifugezig.pdfIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_ffad50b9a54d42b6a04c28d3dea5dac4.pdf?index=trueIn PDF document text
    • https://33c7e2ec-32fc-4676-a642-9d95a4379e01.filesusr.com/ugd/622218_634f1cd6d71c4076b70849247cdfa8ef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavale/88494742785.pdfIn PDF document text
    • https://s3.amazonaws.com/divexikav/chattakkari_malayalam_film_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/levis_uk_size_guide.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_off0000eb13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB13 5696 bytes
SHA-256: 6a4c3558bba4d71cc2d04944896ae6d44d5f61403145b0ebee3dc53a5dee7efe
font_01_sfnt_off0000fe56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE56 11196 bytes
SHA-256: 8861a0c3c0e27685f4a237a2acc1ab4faa2ccf168fda8ce115aedabe35b0a3aa

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