Malicious PDF — malware analysis report

Static analysis result for SHA-256 240f5bceaa1c5978…

MALICIOUS

PDF

84.8 KB Created: 2021-03-28 19:30:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: a55f2157921fd464cdf78d1406d583e6 SHA-1: 730129f8eb49cd7d7b131be312b7a8847f1bebce SHA-256: 240f5bceaa1c59783cd69b3837ce66dccb7dc0bbd7e225d282823346c70af907
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive link farm are indicative of an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=norton+anthology+of+american+literature+volume+c+pdf PDF link annotation
    • http://idem-peshkom.ru/27840738524324aa.pdfIn PDF document text
    • https://wiwanozamo.weebly.com/uploads/1/3/4/3/134306351/xiniju-favaleliguw-xuvaguxomov-xolewuwakenivo.pdfIn PDF document text
    • https://sedogosep.weebly.com/uploads/1/3/4/4/134486754/zifofo-rakimup-tuzum.pdfIn PDF document text
    • https://cdn.sqhk.co/pijajawopoji/FZjhmpg/wowowufewipiti.pdfIn PDF document text
    • https://sulasaboxa.weebly.com/uploads/1/3/4/7/134767053/jagewalixivunut.pdfIn PDF document text
    • http://eurofamily.pro/how_to_convert_diono_radian_to_boosterq6m5g.pdfIn PDF document text
    • http://bigswinner.space/pikekawededumudajatawu6n0tl.pdfIn PDF document text
    • https://dasasaperot.weebly.com/uploads/1/3/4/6/134665710/xejopivegetep_puvijazumalufo_sepisusevuveb.pdfIn PDF document text
    • https://jowidizikut.weebly.com/uploads/1/3/0/8/130874332/2864920.pdfIn PDF document text
    • https://pumutetigowon.weebly.com/uploads/1/3/4/6/134699291/galatewuwoje.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/ibsyEC2/bubiriz.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/gmhdMjj/cash_app_card_atm_withdrawal_fee.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/KZygdjg/codashop_user_id.pdfIn PDF document text
    • http://muzoc.xyz/franny_and_zooey_book_coverersz8.pdfIn PDF document text
    • https://cdn.sqhk.co/pumafuki/haXVjW6/42058621216.pdfIn PDF document text
    • http://ryursew.space/espacios_e_intercambios_vocabulairezx9pn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://56db2a4d-09ce-4ff6-a558-abb1d6727cd4.filesusr.com/ugd/003b86_f328b9882acf42f3a6f7c4221641f532.pdf?index=trueIn PDF document text
    • https://677e6977-fc43-48b2-ac81-16e478c8573b.filesusr.com/ugd/3750c2_3c266728c56c4d4f9c9b7c2e968b9c87.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_47e311bce19943439933942525777668.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7871263a-2fda-4946-9506-561885b8a4d5/simplicity_regent_38_parts_diagram.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30810bd6-61f7-4188-8238-25a0a5de4266/how_to_type_in_google_docs_offline.pdfIn PDF document text
    • https://8b83d164-5e56-46cc-b941-48f48810ddf3.filesusr.com/ugd/76ce43_e1ae704841d1452c8bc22066c51dd656.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dc70c5f-13f9-4f62-8336-1a444262ce41/mapetiwivobib.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D4 5524 bytes
SHA-256: 78e15c22c215f85a6834b111095014f3d010b8ab81a9f8e5230bfa2e3390bc0b
font_01_sfnt_off0001078e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1078E 11256 bytes
SHA-256: de556a8cd26c29cc8fb4b01dd09f6c7e384cb2a43cd6da843affc66330da73e4
font_02_sfnt_off00012dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DFD 16084 bytes
SHA-256: 29b8095464fa9501f2379a4c43ca3ba1b1df604f87f2abcbe11fa9bdafb8ec10