Malicious PDF — malware analysis report

Static analysis result for SHA-256 27a69eb7fc8c03ed…

MALICIOUS

PDF

75.1 KB Created: 2021-05-09 10:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3962a61881c05bc7154a7960ee617c54 SHA-1: 7c362bb74fdc699405ba6b341bf1f130cb490ecf SHA-256: 27a69eb7fc8c03ed4b5ff8ab8faedbbe25e9c17dd329d3e5d06a86e7775ff1bd
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, including one pointing to 'jumiwimov.ru', suggests it is part of a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a pellet stove manual, indicating a social engineering lure.

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://jumiwimov.ru/strik?utm_term=st+croix+hastings+pellet+stove+installation+manual
    • http://optalpha.com/9401648399xm5sh.pdf
    • http://rowexusaje.mypressonline.com/clinical_pharmacy_and_therapeutics_4th_edition.pdf
    • https://sakofavore.weebly.com/uploads/1/3/3/9/133997309/7164437.pdf
    • http://bridgecommerce.com/how_to_install_chicco_newborn_insert1k1yz.pdf
    • http://hotsales-com.xyz/mosilowinuma32a8c.pdf
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/ef1f66c647.pdf
    • https://cdn.sqhk.co/diruzatojep/pohatrv/singer_johnny_nash_wife.pdf
    • http://nubilofanekib.mygamesonline.org/rusixewezorojasanu.pdf
    • http://cadenalia.com/zetizajipofid0rd31.pdf
    • https://cdn.sqhk.co/tememagitapo/khSgfsz/mtg_throne_of_eldraine_draft_guide.pdf
    • https://tovibebifenoge.weebly.com/uploads/1/3/2/6/132695438/76e6880e0.pdf
    • https://lewemesabis.weebly.com/uploads/1/3/4/7/134734043/timabufa_lisurejitom_jafakoratoluvo_xenet.pdf
    • https://nulixedupalaz.weebly.com/uploads/1/3/0/7/130739510/9440009.pdf
    • http://playmarket-online.com/vista_128_user_manualcc5xw.pdf
    • https://cdn.sqhk.co/tatonabufule/ijhis38/zofovewu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/salade/vugij.pdf
    • https://s3.amazonaws.com/dofufiri/limonibidax.pdf
    • http://pikaderobiw.atwebpages.com/do_you_capitalize_mother_nature.pdf
    • http://kewetanetoza.atwebpages.com/anil_s_ghost_summary.pdf
    • https://s3.amazonaws.com/nitidadufetenu/dalutalejigitadupab.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin
1a74faac7b0781a5cad3443d1fde17a191f517a897d9cedb5569a6fe89f05f49		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5576 bytes
font_01_sfnt_off0000f8ca.bin
d36150161b9f6150b73dc7347978210e1d2dc6f66b99deb4a597d5474801de44		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 11388 bytes

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