Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bf3859bd1f32bb…

MALICIOUS

PDF

85.5 KB Created: 2021-03-20 23:06:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19154eaea99e732c950bff878b491f06 SHA-1: 490cac7f63ef046facf0a10285422ba173ed7b5b SHA-256: 83bf3859bd1f32bb6095c048c1b60434a3b5867c8160105b8f1601c5cb2664c0
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it's part of a link farm or designed to redirect users to malicious sites. The presence of 'powershell_in_a_month_of_lunches_2nd_edition.pdf' in the document text hints at a potential social engineering lure related to software training, possibly to disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://druttle.ru/strik?utm_term=advanced+excel+training+online+videos
    • https://cdn.sqhk.co/norumuwapa/XoDgfx7/super_phantom_cat_2_apk.pdf
    • https://cdn.sqhk.co/zopimoforaja/gjhaegE/police_car_vs_theft_bike.pdf
    • https://tugadebijo.weebly.com/uploads/1/3/4/0/134042488/sapubuw.pdf
    • https://xusegabisaxo.weebly.com/uploads/1/3/4/4/134463696/5157291.pdf
    • http://mujudesuxiropa.sportsontheweb.net/wiserixevelesupafuvukuj.pdf
    • https://dodesagetulisuv.weebly.com/uploads/1/3/4/9/134902864/sewenajo-buziwagi-gawukokuzed-wosutedepug.pdf
    • https://cdn.sqhk.co/pizokifuxe/gMgfhcM/twisted_tea_logo_half_and_half.pdf
    • https://cdn.sqhk.co/liminekaj/7lhfygj/deremekadobal.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://161abad2-7de2-49bb-9904-d6e2a620a662.filesusr.com/ugd/2eec94_4b9cf21c1c2b4eaabe30ef7fcc249e1c.pdf?index=true
    • https://s3.amazonaws.com/gogunabones/coorg_weather_report_today.pdf
    • https://s3.amazonaws.com/nuxulikiwab/command_and_conquer_game_for_pc.pdf
    • https://uploads.strikinglycdn.com/files/548e8aa9-1eeb-41ec-9923-22447db9381c/23115430771.pdf
    • https://s3.amazonaws.com/jarawaxanivu/assistant_dentaire_salaire_formation.pdf
    • http://dasobiviwadodaj.atwebpages.com/29276106928.pdf
    • https://uploads.strikinglycdn.com/files/6e49b85b-f8c2-4122-b2bb-4a2dfcbaee0a/tom_clancys_rainbow_six_siege_walkthrough_part_1.pdf
    • https://uploads.strikinglycdn.com/files/a7e9ed2c-fb36-410f-864a-a9669d7ea659/tadimavovixudafepefop.pdf
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_90ba4e3d1b7f443d89dd413511ade06d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a9030196-7532-4aff-9a46-cf86f4b0b5b6/how_much_horsepower_does_a_jeep_cherokee_srt8_have.pdf
    • https://s3.amazonaws.com/kagedatabujo/learn_powershell_in_a_month_of_lunches_2nd_edition.pdf
    • https://s3.amazonaws.com/salade/58124153640.pdf
    • https://944456f3-75eb-4cd6-bbfd-656b3713ada1.filesusr.com/ugd/2c8d66_182ea20a4fa44589b877dc3fce833831.pdf?index=true
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010724.bin
fee40871d5c653a58bbc3e5ecc8ebf96761097ae45accc9778bb96cf2af4e9f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 5012 bytes
font_01_sfnt_off0001183d.bin
607868e7b92a5f3e05d1d6d1e804078748958ce60ff280a25a88fa8ea04e5267		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1183D 9972 bytes
font_02_sfnt_off00013a3b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13A3B 4324 bytes

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