Malicious PDF — malware analysis report

Static analysis result for SHA-256 b668da9069298bb3…

MALICIOUS

PDF

95.8 KB Created: 2021-05-02 11:48:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 9dcc5cada751952cd41e189ec82da62b SHA-1: 9ff96a39d5d59758d6018d59f9d439627f1d7714 SHA-256: b668da9069298bb36edd5cbb8477c908821694c231132ad518baa63e42e53d68
186 Risk Score

Malware Insights

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

This PDF file functions as a link farm, presenting itself as a search result for a software manual to entice users to click on external links. The primary URL, 'https://golowaki.ru/strik?utm_term=ashrae+handbook+fundamentals+2013+pdf+free+download', and numerous other embedded URLs point to disposable hosting or domains commonly used for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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=ashrae+handbook+fundamentals+2013+pdf+free+download PDF link annotation
    • https://cdn.sqhk.co/xexanodu/Thdjg3e/xalare.pdfIn PDF document text
    • http://frankiearvelo.com/joleparonazh4vtl.pdfIn PDF document text
    • https://cdn.sqhk.co/temokika/hiFFMif/ginufifuxisixonimomamuke.pdfIn PDF document text
    • https://cdn.sqhk.co/taxotuzu/iMiaQNM/82859685454.pdfIn PDF document text
    • https://cdn.sqhk.co/tunaluvum/Lgeibjf/zombie_combat_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://tomogorman.com/vejuzalobalirnak8.pdfIn PDF document text
    • http://mbfsopg.com/16693409414zbode.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwipabobatu/IhasgdD/pagajerukuz.pdfIn PDF document text
    • https://cdn.sqhk.co/gukawaki/giD45jI/kilolepebojuverameburex.pdfIn PDF document text
    • http://notdull-eng.online/english_conversation_esl_topicsh74qy.pdfIn PDF document text
    • https://cdn.sqhk.co/jogeguzotire/dGOHgc3/a_little_war_2_revenge_hack_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/walumupo/UUn892Z/8724768139.pdfIn PDF document text
    • http://xenuponominabek.iblogger.org/wiwomiwokigijorajujagamot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jezobasit/pezuja.pdfIn PDF document text
    • http://pibunowawoxi.epizy.com/how_to_fix_sheetrock_corner_cracks.pdfIn PDF document text
    • https://17a6c5a8-0587-4adf-8126-5b439e15a62f.filesusr.com/ugd/54bec1_0ab0c94490294208908aab60aa87fdfa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xeponodij/biblia_en_audio_genesis_38.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_c4c39721f1e24d44b808de30ed91fa29.pdf?index=trueIn PDF document text
    • http://pajamubo.rf.gd/bijiliwadiseva.pdfIn PDF document text
    • https://4590046d-f0a9-4171-b8a0-56ff8c1fe63c.filesusr.com/ugd/0bfb20_417899bad77b46a4b5d605e44edee8c2.pdf?index=trueIn PDF document text
    • https://4cd5eafb-d261-4666-a528-29b55b1676c1.filesusr.com/ugd/8dde66_ed34a593d9f944faa86bd6660e66dd8e.pdf?index=trueIn PDF document text
    • https://19d8af67-ac20-4a7c-8ffd-69be953788a8.filesusr.com/ugd/578741_e310b44047b94f1eb6a76b3b61ea0143.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fujadabez/57437933620.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/coleman_roadtrip_bbq_parts.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E3 6056 bytes
SHA-256: b2b2749af7c34cc8aab5e2f3c6b6e4be0417f26acc1aa78c08712fb0a3e6f17a
font_01_sfnt_off00012e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E62 13156 bytes
SHA-256: 9363089a9f7d9dff278790267237c2bb477cb9a821774f6528d4dfc8a04679e2
font_02_sfnt_off00015b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0F 16364 bytes
SHA-256: aa3b3570abfb000a5693d58cbd1a6af11c2b1db596da20b1cb1cbd4bdc7c77bc

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