Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c744640d5dc008c…

MALICIOUS

PDF

76.0 KB Created: 2021-05-11 17:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7fe86d25264bf6bfe883f547e934bc04 SHA-1: 9141a414765cc351567fa63425e81347c6720d50 SHA-256: 8c744640d5dc008ce0b09bf2ef77a916b9fbeae4765f691d53ba570be52001f9
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The embedded URLs are likely used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/strik?utm_term=electric+pressure+cooker+recipes+for+beef+stew PDF link annotation
    • http://kusafomidufe.mywebcommunity.org/as_time_goes_by_casablanca_piano.pdfIn PDF document text
    • http://xejepurefe.scienceontheweb.net/how_to_shred_diet.pdfIn PDF document text
    • http://timelessdecorum.com/15108109437oicsf.pdfIn PDF document text
    • http://bestgirl69.com/sefijgxaik.pdfIn PDF document text
    • https://jerewerek.weebly.com/uploads/1/3/5/3/135349205/4868632.pdfIn PDF document text
    • http://luminar4-download.xyz/bella_juicer_manuallgab8.pdfIn PDF document text
    • http://help-mediasupport.com/fitogalebkatl.pdfIn PDF document text
    • http://trysoda.club/38785285926zceee.pdfIn PDF document text
    • https://nokajadum.weebly.com/uploads/1/3/4/8/134887388/804524.pdfIn PDF document text
    • http://yachts-4-sale.com/rowirugelawejekyjqgb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/856bc02d-6832-4584-87a8-c1ad43c39061/how_to_make_a_bow_tie_for_your_dogs_collar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/336a1db6-97ab-48da-bcc8-38321ae2ea1f/827899732.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca3808f6-6d5f-4424-93df-3922388e8198/kovow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/328299d2-6815-4020-8635-9016eb75b8d5/dafufezodefidofovemosavor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec764861-d09f-4f01-b191-6c0265409675/pathfinder_pawns_npc_codex_box.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d2b37b4-36c3-4cec-91cc-766a4f6abfc1/sudavedexipolevulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cef38689-72b9-4347-a47b-9decf78db1d3/speed_queen_washing_machine_belt_size.pdfIn PDF document text
    • http://gajopule.myartsonline.com/sets_relations_and_functions_class_11_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a64196b9-6b2d-4aec-903a-8f086193313f/is_pensacola_a_spring_break_destination.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eba2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA2 5052 bytes
SHA-256: 5a1b044cc0e7747c3a7befc50d23d728eb6d11eb5abf73bf90ed25f98007328a
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 11060 bytes
SHA-256: 22d3f15593d740cb9dd8763c858b8c2cb2ca5bf0c7ab9d5b43067a2bd711a7cd

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