Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8464a74d6901e4…

MALICIOUS

PDF

74.1 KB Created: 2021-03-12 04:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64ae10550bde7d34345677390cf96e1d SHA-1: 1f9ec38660bfd2242dbd35bd6add09f48f53b55f SHA-256: 4f8464a74d6901e4975781ef8bc0ca331e1a3c22aa2d9e32f65f2c8c341ac9d9
156 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to trick users into downloading further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://resalured.ru/award?keyword=alif+novel+episode+4+pdf+download
    • http://dojimifarekajiw.iblogger.org/rovuzaz.pdf
    • https://cdn.sqhk.co/dabozijide/QjgSAYY/xeborudusogeguwofewezeli.pdf
    • https://cdn.sqhk.co/kitijorawul/ih7ihhf/business_board_indonesia_mod_apk.pdf
    • https://cdn.sqhk.co/fezivabuja/giggpgg/tiny_archers_app_download.pdf
    • https://kuxijalubekuvi.weebly.com/uploads/1/3/4/6/134602409/4475271.pdf
    • https://cdn.sqhk.co/lenubire/jM0hhid/pagevidikipalutokamowijox.pdf
    • https://wijinopupog.weebly.com/uploads/1/3/5/3/135323990/7859170.pdf
    • https://vamukeroke.weebly.com/uploads/1/3/4/3/134353023/4171983.pdf
    • https://cdn.sqhk.co/dowepigakaw/Gdgjm0I/zorinomedijolap.pdf
    • https://cdn.sqhk.co/kajutizikodu/jFEdnig/scary_teacher_video_call_chat_simulator_pranks.pdf
    • https://cdn.sqhk.co/bodorosuzuta/j7mCp4F/67030248142.pdf
    • https://fimusaruto.weebly.com/uploads/1/3/4/4/134472122/6358503.pdf
    • https://cdn.sqhk.co/kajurineg/XrijG9E/kapusekadikusirerisopiti.pdf
    • https://dikajumexuw.weebly.com/uploads/1/3/4/3/134324924/feruzezemet-sikazixelalil.pdf
    • http://samejeno.iblogger.org/lenovo_y500_bios_mod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zifasodokid.epizy.com/apc_smart_ups_3000_manual_rack.pdf
    • https://uploads.strikinglycdn.com/files/2d641625-c0da-457c-90d4-821f0c675fd1/cirque_du_freak_book_3.pdf
    • https://uploads.strikinglycdn.com/files/a062d8c9-0014-4f31-935e-009507ea7fe1/thermodynamics_book_for_diploma_mechanical_engineering.pdf
    • https://uploads.strikinglycdn.com/files/1386d995-4769-41ab-b3e0-289e730a7bf5/zone_of_proximal_development_and_scaffolding_examples.pdf
    • https://uploads.strikinglycdn.com/files/79d8be5d-7a57-44b2-8326-3bd91da63d63/usa_live_vote.pdf
    • https://uploads.strikinglycdn.com/files/dcd4ef77-b34c-45e5-b8ef-040b5aed6d51/insinkerator_badger_100_installation.pdf
    • https://uploads.strikinglycdn.com/files/d14f0e3b-d73c-4ecd-b587-362b95fea36d/percy_jackson_cast_poseidon.pdf
    • http://dojeranorered.epizy.com/gajugabujenijunogotiz.pdf
    • https://uploads.strikinglycdn.com/files/72d0b373-73ec-4090-988f-b9591c3d59dc/fisefokakemoxob.pdf
    • http://vimitafukufes.rf.gd/dixod.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_off0000dcfd.bin
871699f25fe43913aaf9ffd7c4708841190438d28e5aa5f0d5a92de2fbf68797		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCFD 5168 bytes
font_01_sfnt_off0000eecf.bin
8a35879e333bc41ad82977976442ec3ecea97ebed129cd3751fb6eddcc0033a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 14148 bytes

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