Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fa8a66385a92221…

MALICIOUS

PDF

76.4 KB Created: 2021-06-11 20:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9157ae969b2af8e2a46041ae8072a0f1 SHA-1: 07d2be25a58a79b1c1b80786faf4e8d76f1ffb9a SHA-256: 8fa8a66385a9222170eee2581f065e46998d4b78b105ebc53c9d207e88f514ea
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The primary URL, https://coretry.ru/pbw?utm_term=sims+4+free+download+android+no+verification, is presented as a lure for downloading Sims 4, indicating a social engineering tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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://coretry.ru/pbw?utm_term=sims+4+free+download+android+no+verification
    • https://venaresumizom.weebly.com/uploads/1/3/4/4/134468274/polepo_xesuni_nexetov.pdf
    • https://padixegidenu.weebly.com/uploads/1/3/1/1/131164435/87dc5d4e5a11fb.pdf
    • https://musuvawe.weebly.com/uploads/1/3/4/5/134528527/1d405bb3ce.pdf
    • https://werovowota.weebly.com/uploads/1/3/4/7/134766705/jeseg.pdf
    • https://moxipilewuzeget.weebly.com/uploads/1/3/4/3/134360433/7d9b24aab.pdf
    • https://tuzunogosur.weebly.com/uploads/1/3/0/8/130815213/4327114.pdf
    • https://zalamozosuk.weebly.com/uploads/1/3/6/0/136089451/nogivosevoj.pdf
    • https://nojinogexosop.weebly.com/uploads/1/3/4/6/134695112/jegixuxamep.pdf
    • https://fiziwiminika.weebly.com/uploads/1/3/4/6/134686918/lurisara-sedawomilera-pejumewagevako.pdf
    • https://makukojubava.weebly.com/uploads/1/3/0/7/130739489/57974ac569.pdf
    • https://dedodewoluxo.weebly.com/uploads/1/3/4/4/134402612/vinux.pdf
    • https://bafejavug.weebly.com/uploads/1/3/4/7/134737311/kuzurolusaredexefasa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xafusigivu.pbworks.com/w/file/fetch/144663156/39440378472.pdf
    • http://fafukite.pbworks.com/w/file/fetch/144996156/pulolowujedowivazoxu.pdf
    • http://fosirodovo.pbworks.com/f/download_game_kick_the_buddy_forever_mod_apk.pdf
    • http://lopofemusun.pbworks.com/w/file/fetch/144498813/what_are_the_duties_of_a_project_manager.pdf
    • http://kolasotosexu.pbworks.com/f/sipigafe.pdf
    • http://dewubuk.pbworks.com/w/file/fetch/144940647/fajovufijikuxorujum.pdf
    • http://zanonot.pbworks.com/f/shl_psychometric_test.pdf
    • http://gonumutat.pbworks.com/w/file/fetch/144726636/95476280375.pdf
    • http://dumajimov.pbworks.com/f/gaxokubugiwid.pdf
    • http://nukisefel.pbworks.com/f/cinema_hd_v2_buffering_on_firestick.pdf
    • http://pululojufi.pbworks.com/w/file/fetch/145136982/mods_for_minecraft_pe.pdf
    • http://xutosop.pbworks.com/w/file/fetch/144462870/how_to_reset_samsung_vrt_washer.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_off0000edd6.bin
91e95c335199a536b6ae725048c950ed565c52559bd005e008c79fc4b423c2d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 5508 bytes
font_01_sfnt_off0001009a.bin
880f3d4a9dce24666ddcad05848f8b3daff9ce128c1bf5886cbd546101d659a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1009A 10132 bytes

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