Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf07e7f2fc5ebb1d…

MALICIOUS

PDF

72.7 KB Created: 2021-06-06 12:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 17a33b0947a496a35924da639516c857 SHA-1: 935694cb71f8b65735fe7f91fd9ec263b1fb1624 SHA-256: bf07e7f2fc5ebb1d623a6d9bafcc086a8c530f8c22b3a9d56ece850ec98132a0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or use UTM parameters, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques 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://ketchas.ru/pbw?utm_term=how+to+connect+honeywell+t5+thermostat+to+wifi PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378620/normal_5fd2d0d80f2ed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468838/normal_600a0814778bb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446638/normal_600401e24448a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484355/normal_5ff2d6b55da89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_606025adece41.pdfIn PDF document text
    • https://ruwelijowabol.weebly.com/uploads/1/3/4/3/134307429/sujikokaxeselarim.pdfIn PDF document text
    • https://lixemuvoxowogod.weebly.com/uploads/1/3/4/8/134878154/lagegadabatirudi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417659/normal_6014b272408e1.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/a20fa487-0516-4606-992e-8462cd6620ff/how_to_write_meeting_invite_email.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0110569b-f64e-4605-a1cb-03870eae72ee/tik_tok_love_song_whatsapp_status_sinhala.pdfIn PDF document text
    • http://nefusim.pbworks.com/w/file/fetch/144434661/free_printable_color_by_number_preschool_christmas.pdfIn PDF document text
    • http://vomuseteweto.pbworks.com/w/file/fetch/144687261/kavazefividudomaxawesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89274f4d-44de-481a-98b4-9389bfcec1b5/pokemon_super_mega_fire_red_gba_rom_download.pdfIn PDF document text
    • http://mivegaz.pbworks.com/f/86906237636.pdfIn PDF document text
    • http://tosuvop.pbworks.com/f/fallout_4_manufacturing_extended_component_extractor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bda9b508-b378-4713-9fba-e8374c07b73c/21474122783.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e40197e4-af29-4fc2-b373-4e0691ecc66f/zewejagemazirapa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7449850e-4d3e-47b6-bf5c-0ad644c2beb1/pazoraxenoxudetisonasu.pdfIn PDF document text
    • http://gutupum.pbworks.com/w/file/fetch/144630978/administracion_financiera_basica_lawrence_j_gitman.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_off0000dd00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 5400 bytes
SHA-256: 40fa8282ab542c58b9ccafe7549a3a036f586cdc56d83211c74f6701ad00fe71
font_01_sfnt_off0000ef51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF51 11140 bytes
SHA-256: e93dcebcc9667be9ac1342e7e1f50e6b75d5c0ce7640171166ba61f75e35c31e