Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d664d6fff587daf…

MALICIOUS

PDF

90.3 KB Created: 2021-04-04 00:06:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e009f70bdf037f89190c85dba654701 SHA-1: 5a90f6eedc45d041addcda78f13db47215d33103 SHA-256: 3d664d6fff587dafce0122b7a09b27f7aa4f5ce755dfd38e24a609cd7da893ea
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 it is part of a link farm designed to drive traffic to other sites. The document body, though heavily obfuscated, appears to be a lure related to a 'Russian alphabet worksheet'. The presence of embedded URLs and the link farm heuristic indicate a phishing or content-serving attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://jacksth.ru/award?keyword=russian+alphabet+worksheet+pdf
    • https://bigonokefexix.weebly.com/uploads/1/3/4/5/134518339/dexeteparaminakuveda.pdf
    • https://cdn.sqhk.co/jasolugud/ehjei8j/cytogenetics_lab-_karyotyping_answers.pdf
    • http://dikerulaba.22web.org/37964405471.pdf
    • https://cdn.sqhk.co/bugokasite/cjaAjju/32434415855.pdf
    • https://vebazefi.weebly.com/uploads/1/3/4/0/134040586/digazirig-sewinabirifuf-nekudofa-xetafevobabula.pdf
    • https://zolerowiz.weebly.com/uploads/1/3/4/6/134691656/resir_dusefozevo_bitodiwaro_komatipijo.pdf
    • https://cdn.sqhk.co/fivuwunar/iQx7YU0/stay_alert_stay_alive_victoria.pdf
    • https://cdn.sqhk.co/vefapatape/foSXYgh/runidigunulal.pdf
    • https://figinesixixe.weebly.com/uploads/1/3/3/9/133999389/6178927024.pdf
    • https://cdn.sqhk.co/nebinefis/jMjajgZ/38407434857.pdf
    • https://dizoxagesok.weebly.com/uploads/1/3/4/3/134363212/5228027.pdf
    • https://dazuzezabemor.weebly.com/uploads/1/3/1/3/131380892/wazizulipipig.pdf
    • https://cdn.sqhk.co/zamepeja/fgfhcic/brain_test_2_tricky_stories_game.pdf
    • https://zoluwapipapak.weebly.com/uploads/1/3/5/3/135321816/2465796.pdf
    • http://fasoxuxesatilu.sportsontheweb.net/facebook_business_model.pdf
    • https://cdn.sqhk.co/bakimexatura/esihkyf/apopleja_cerebral.pdf
    • http://gidepel.22web.org/savovasavesedasiwaz.pdf
    • https://cdn.sqhk.co/raxuzuvuluf/phcighg/anime_the_last_battle_of_the_cosmos_characters.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://zowofiz.myartsonline.com/jean_genet_cameristele.pdf
    • http://detuxidamuw.rf.gd/assemblies_of_god.pdf
    • http://saxodanokijaj.atwebpages.com/dell_optiplex_760_service_manual.pdf
    • http://jokilezitewoj.epizy.com/6th_grade_social_studies_study_guide.pdf
    • http://dapekafuxururo.myartsonline.com/alimentos_transgenicos_en_ingles.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f42c.bin
4241d33b9b0f46a2487ea212ad6203ddce3ae2242de5059d21a2cfe0dfda31fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF42C 5316 bytes
font_01_sfnt_off00010636.bin
b454f9e600549ac5f1349836c4425e26c288cc665460ceac8a26f71b33a31d93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 15188 bytes
font_02_sfnt_off000135a5.bin
410c4cfc51ba80ea98980c38022af42b658dc6332bc16b83d909270c17f41590		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A5 17476 bytes
font_03_sfnt_off00014d61.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D61 4324 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.