Malicious PDF — malware analysis report

Static analysis result for SHA-256 83ae0c7398fd225e…

MALICIOUS

PDF

87.0 KB Created: 2021-05-14 01:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 868cf284ee1cc2ea6ae5cf51e41e0fd9 SHA-1: 7c4d55795a941a78518ff947ace236d419310db4 SHA-256: 83ae0c7398fd225e158a848665409c2d7d30b6b45d2be7773f3709aee307ce2e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to distribute or phish via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=easy+yoga+asanas+images+with+names+in+hindi
    • https://cdn.sqhk.co/kolusugego/ekupheD/bubble_story_mint_games.pdf
    • http://bidimiw.sportsontheweb.net/45576081516.pdf
    • https://cdn.sqhk.co/soziwariru/hiia5LL/bootstrap_3_form_example.pdf
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdf
    • http://ttttrrrr.space/3d_bike_racing_game_online_play_freevwzct.pdf
    • https://cdn.sqhk.co/vasibejovej/faMvj22/6196749097.pdf
    • https://cdn.sqhk.co/nozujeraguje/hjjiign/56293243002.pdf
    • http://maslovauto.ru/tuguzab1h93.pdf
    • http://digitalmicroteter.xyz/how_to_change_transparent_background_to_whitekfo4v.pdf
    • http://badgesverified.com/dell_all_in_one_optiplex_9010_core_i5_3450sd69gx.pdf
    • https://cdn.sqhk.co/laxefotogulo/gfGgjiS/32919561827.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://mowogaw.mypressonline.com/family_therapy_concepts_and_methods.pdf
    • https://cdn.sqhk.co/vofepubot/hdiihgT/piriform_ccleaner_update.pdf
    • https://cdn.sqhk.co/lupobikud/hcnCXBh/frozen_lemonade_recipe_with_lemon_juice.pdf
    • https://cdn.sqhk.co/zarudaletok/hQZ4jha/xinadoreduxibused.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://73af689e-4c80-4f62-99d3-7a886641ad81.filesusr.com/ugd/3b5dd9_bcf93d684c4642c3a9e6ca9a6993615d.pdf?index=true
    • http://wegugoleta.onlinewebshop.net/mudefijuves.pdf
    • https://8c285b57-3156-47ce-881b-df665acc117b.filesusr.com/ugd/8d46c2_dd2461fc1cf2455db17c8439702df782.pdf?index=true
    • http://zisukuvi.atwebpages.com/business_environment.pdf
    • http://josesomesube.myartsonline.com/le_grand_livre_du_bouddhisme.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_off000116ce.bin
2177c2346f6348a650ea02ed4a3ab6608b888ff191ce7ed20df235fe5d81f34e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116CE 5264 bytes
font_01_sfnt_off000128aa.bin
a1ed604a95d54c68fded9b44f01d70d0cf9a8be52bccc07a33d3c81afca0a420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x128AA 10508 bytes

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