Malicious PDF — malware analysis report

Static analysis result for SHA-256 81fa5904a289183c…

MALICIOUS

PDF

78.4 KB Created: 2021-03-23 03:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb113164df77a9bbd886fc74620cf7c SHA-1: d9af405ce35a26e1a53ddb2b9a80eb32ad5d327c SHA-256: 81fa5904a289183c29415bf21f061e6458b51900bff3dee91d5f1b29ecd92224
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, contains text related to resetting a Polaroid Bluetooth speaker, which is likely a lure to direct users to malicious URLs. Several external URIs were extracted, with the primary one being https://kuzutuzo.ru/strik, suggesting a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://kuzutuzo.ru/strik?utm_term=how+do+you+reset+a+polaroid+bluetooth+speaker
    • http://ogranicbio.fun/regewasapepavuvuvizy7ke3.pdf
    • http://eferevole.com/xowetus8289v.pdf
    • http://muxoman.mygamesonline.org/59110026581.pdf
    • http://believes.space/oxydorduction_exercices_corrigs_bac_projb6c5.pdf
    • http://zugobopepoj.sportsontheweb.net/bizotalegoxegoludeteki.pdf
    • http://jusapp.club/936373019485wqsl.pdf
    • http://uscreditcheck.info/an_inspector_calls_scene_2_summaryqjkdu.pdf
    • https://forugizatufuru.weebly.com/uploads/1/3/1/4/131410167/19e4b998569.pdf
    • https://gibuximo.weebly.com/uploads/1/3/4/6/134665594/xuvironeviripu-bikap-vimaxatof.pdf
    • http://train-home.ru/juguf70dis.pdf
    • http://copyrightsupporthelpcenter.com/99024665204xpdbn.pdf
    • http://pobunav.sportsontheweb.net/que_es_bienestar_laboral.pdf
    • http://sfhgfje5df.xyz/665502196865s243.pdf
    • https://giromazipudu.weebly.com/uploads/1/3/1/4/131453901/litawoseliweziwap.pdf
    • http://filuxunokenobud.mygamesonline.org/pdf_marketing_management_notes.pdf
    • https://rezibufebaxiban.weebly.com/uploads/1/3/2/6/132695258/5131061.pdf
    • http://omynutural.space/bostitch_sb-_1664fn_manualr6fcs.pdf
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/suduvesuvivarepobunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xakusineba/yeti_mic_settings_symbols.pdf
    • https://s3.amazonaws.com/purixifusipelid/80953292045.pdf
    • http://sajulugebimisu.myartsonline.com/what_can_i_feed_my_daphnia.pdf
    • https://s3.amazonaws.com/bisapovepizaj/outfits_formales_2018.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_off0000f405.bin
30468aaa6628c540053fc913c9d230fd45b068bd32e35601cc9ab3430ce8d1e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF405 5404 bytes
font_01_sfnt_off0001066d.bin
2c9d4a142766c502ed7171c5adeba013c56b1a5ba89d22ed27944915193f296c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 11216 bytes

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