Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9acb0d92fcdec11…

MALICIOUS

PDF

84.1 KB Created: 2021-04-05 05:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 94795268da4a5926f098221c05f1afde SHA-1: fb1475a1cfa2848c5287e74c4d882cf301b9184b SHA-256: b9acb0d92fcdec11318c96b825527171c9549d72969bf4979a117fc15141cf2f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting or suspicious domains, suggesting a link farm designed to redirect users. The document body, though heavily obfuscated, appears to contain metadata related to its creation and potentially misleading content about a book title to mask its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=advanced+analytics+with+spark+2nd+edition+pdf PDF link annotation
    • https://cdn.sqhk.co/sadebupunen/jgihsr0/45769042392.pdfIn PDF document text
    • https://cdn.sqhk.co/fexiseme/Voicx6B/7771438954.pdfIn PDF document text
    • http://axacheat4.xyz/what_or_who_is_yahweheglzy.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikuzi/jbidUK4/jokulikivifutet.pdfIn PDF document text
    • https://cdn.sqhk.co/lenubire/idEibjb/scary_sound_effect_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/zarepowake/giv8Djx/41535669171.pdfIn PDF document text
    • http://specrazreshenie.com/2650963584rut7q.pdfIn PDF document text
    • https://kuxivudu.weebly.com/uploads/1/3/0/8/130813582/lozorafikuliwabi.pdfIn PDF document text
    • https://cdn.sqhk.co/sumodomuro/cgg7egc/96358772721.pdfIn PDF document text
    • http://fredo.run/giwulukolepefofukxii.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/nhhNggP/fomuginedorelosesiwuxonu.pdfIn PDF document text
    • https://tedovuja.weebly.com/uploads/1/3/4/4/134465286/kijazekuvajujix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c43cb74-45e3-47de-9527-fda2e8336169.filesusr.com/ugd/af0aa9_27596032bc454c10a62625bc66af4fb0.pdf?index=trueIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_6c312cd75f664da38a639cc890220d4e.pdf?index=trueIn PDF document text
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_0374381d04854977b59e1d876a5707ac.pdf?index=trueIn PDF document text
    • http://juludiripo.myartsonline.com/pifigofovovatalofo.pdfIn PDF document text
    • http://madepadejatutof.onlinewebshop.net/woseresukafasulinogezese.pdfIn PDF document text
    • https://cef8af8d-7071-4339-ac50-fc417d371010.filesusr.com/ugd/a89196_abb990b47f7b44d891bbccf3c903f82a.pdf?index=trueIn PDF document text
    • https://ddd90330-5837-4e0c-b2f6-9383941cd2db.filesusr.com/ugd/568e2c_883381a716fa4f54a426a8d59a43dc2b.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_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 5684 bytes
SHA-256: bfb3887198ef4854d737c3881820c1ccc6d7df047ee2d1a0fb0c31fe1127a529
font_01_sfnt_off000119d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119D1 12488 bytes
SHA-256: 7050ab02cb122d9c628e61e26653508295c2c30f65c84a43af82045d980d1f2a

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