Malicious PDF — malware analysis report

Static analysis result for SHA-256 abee84fc543dbc65…

MALICIOUS

PDF

151.5 KB Created: 2021-05-10 19:40:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fe543b1a7d1db1d3f4741d93006dd7bd SHA-1: 1261ef02853b0df38be7e4d3550d7a781a4ba7c8 SHA-256: abee84fc543dbc653011df9f429f6325126776ac5db3543106e083b6e4334cbd
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://midufefew.ru/strik?utm_term=fearless+fortnite+youtuber+dead PDF link annotation
    • https://teputire.weebly.com/uploads/1/3/0/8/130813428/jakugitujanufi.pdfIn PDF document text
    • http://zumanidoxup.medianewsonline.com/creative_art_director_portfolio.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408594/normal_606cc4074c2dc.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/list_of_important_days_in.pdfIn PDF document text
    • https://tamusibexo.weebly.com/uploads/1/3/5/9/135966636/wivikukenixu_kakekejanafe_berituxowi.pdfIn PDF document text
    • http://xonejalevesezom.sportsontheweb.net/powershell_base64_decode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500665/normal_604cc93045747.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0bIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://31f314b5-0768-4c24-bd49-4596ea953b46.filesusr.com/ugd/85a4b1_9832c23d719048d59232ec0784fa9b98.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_403f0ff4b4064e58b47ad64c23489ae0.pdf?index=trueIn PDF document text
    • http://tipipigi.atwebpages.com/28743085347.pdfIn PDF document text
    • https://254b3b0b-79dc-4992-827c-fd4bb3db3178.filesusr.com/ugd/f515ca_6d3858fa59a748beaac0ee197de9adf8.pdf?index=trueIn PDF document text
    • https://76b44699-1094-4fd8-8d4a-70b7be8159c3.filesusr.com/ugd/c450b2_973bbb0323e044f9b3d082a1440effbe.pdf?index=trueIn PDF document text
    • https://a4067306-84c0-45ce-9c36-3cbb795fcb37.filesusr.com/ugd/d5b970_51439a404bce4e7f9d0f0b1f8d8c1836.pdf?index=trueIn PDF document text
    • http://pesetunal.onlinewebshop.net/dcs_world_mission_editor_triggers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be28665d-c2fc-4cec-b9d3-c9615d98390b/59820626725.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3b7fd57-68a8-4ff2-a817-170f2c496790/dujozuwivimebeteronewux.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_c17fdfc4e43043ab8e6d1a69dbb53f2a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c36876-0c0b-4126-9fe8-6f613afae1c5/modern_arabic_calligraphy_letters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/948e5d57-2d27-4e5e-83e5-6e6f3b8c59ae/who_moved_my_cheese_synopsis.pdfIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_7efc807d14c3451783894f53d68c4495.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_ccfbf08aff8048f8a606232499af0646.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FFE4 4740 bytes
SHA-256: 4deaf2e4179618d7bd0cc5b0396f4aa0841b6f19459b8698fa4a34869ed79b69
font_01_sfnt_off0002104c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2104C 5100 bytes
SHA-256: 5894c40dca22960ed9b79fe6cd36d3354adcd9b637412c6065dfd117d87203a8
font_02_sfnt_off000221b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x221B6 14588 bytes
SHA-256: 6099f57dfcd25a83beec60e24757664df11c03519596d4ee3113fd5802ce98f2