Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf78ff076967a479…

MALICIOUS

PDF

77.8 KB Created: 2021-03-06 04:15:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 3a354d562a4892bd7e497863908fb010 SHA-1: d8ac22af99e1f3871f6eec5d44632008c52e01e5 SHA-256: bf78ff076967a479f34a09462ac0cf5c2264ee330b27bf87f00b80c29fc2dd72
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or link farm document. It contains numerous external links pointing to disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host a large number of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=what+does+a+first+year+law+student+need PDF link annotation
    • https://cdn.sqhk.co/bilanogakiw/nB7ijvr/tefitalujez.pdfIn PDF document text
    • https://cdn.sqhk.co/kutupejotige/hjf5qeq/costume_ideas_for_halloween_for_couples.pdfIn PDF document text
    • http://filemarker.store/852533030163yk4s.pdfIn PDF document text
    • http://miwewumexurigan.sportsontheweb.net/are_chromebooks_any_good_for_photo_editing.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ZSR5gdm/piano_virtual_with_notes.pdfIn PDF document text
    • http://reduslimitaly.website/235375557369t5jx.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/egcjfqt/76580930108.pdfIn PDF document text
    • https://lujukote.weebly.com/uploads/1/3/2/7/132712447/3393792.pdfIn PDF document text
    • http://fuxisileza.mywebcommunity.org/faropezetikulugaluwokagu.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/ehbq5ja/this_means_war_song_gospel.pdfIn PDF document text
    • http://xruhdfo.site/9371806235sm59g.pdfIn PDF document text
    • http://kostlike.site/vupupetiwifodimisibemcm1ig.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/15769268078.pdfIn PDF document text
    • http://bred-enligne.com/lexan_polycarbonate_sheet_in_chennaiefgy6.pdfIn PDF document text
    • https://tiwedipetubed.weebly.com/uploads/1/3/2/8/132816066/totewuk-kunisepipi-lafubinigo-wibewizijalize.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19aaccd0-9772-41b6-85c4-be118606641a.filesusr.com/ugd/a12125_4b2e687b161f416fb2e536b3336029a1.pdf?index=trueIn PDF document text
    • https://2061f665-9309-41a6-981d-137229ee7e60.filesusr.com/ugd/eb2fe6_2288411a44aa4bf7b3c97d099c1a10d5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6550142-def9-4b80-bcff-792bac09f8b2/mugurowiguxed.pdfIn PDF document text
    • https://e691ad07-92dc-45fa-af10-8929b4045ede.filesusr.com/ugd/87b9a8_68ec78646d694a51a1bffcdc7c3796fb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0425949-85cf-4839-a666-8e053f0b2e4c/used_john_deere_tractors_for_sale_in_maine.pdfIn PDF document text
    • https://6d706a39-1f93-4f1a-9423-caccf7e65e71.filesusr.com/ugd/69f91f_46721575e7a140bebab7cda59c2ab692.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5200 bytes
SHA-256: 87acfbcc074b868b730902fe5b3ccb4acf097d4d5dea3b82407fd52fb995df5c
font_01_sfnt_off000105d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D3 10388 bytes
SHA-256: 95b8bf81de11220e07f3a804da034f61c42c17f7fbca51465d662357274e00fd