Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2084529c4fe210d…

MALICIOUS

PDF

90.2 KB Created: 2021-04-05 09:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: dbfc6cdbd584ea77551f923f1d26610b SHA-1: 0e646b2cc3990a5a7324082bbbeae14a3144dc78 SHA-256: b2084529c4fe210d91d1450816ddd6aad9363cf5ef284ce5bef20a59c51f648a
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 hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URIs are indicative of malicious activity, likely spearphishing via attachment.

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://jumiwimov.ru/strik?utm_term=unofficial+skyrim+special+edition+patch+load+order PDF link annotation
    • https://getiwojaxewife.weebly.com/uploads/1/3/4/0/134012456/wirijiwonuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/fopikudapom/Wijggja/grumpy_cat_christmas_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/muditazu/GZ1iagj/age_of_empires_2_play_free_online_games.pdfIn PDF document text
    • https://cdn.sqhk.co/binuwaxe/uidGr0h/guwexepupikajobilitijorif.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff0752ceb482.pdfIn PDF document text
    • http://naxovonukile.iblogger.org/construction_site_inspection_checklist_template_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/zupitefa/huig64E/43843132894.pdfIn PDF document text
    • http://zabatipudug.iblogger.org/54128481773.pdfIn PDF document text
    • https://kogafisefog.weebly.com/uploads/1/3/1/4/131438876/6afc2c7238c0bd.pdfIn PDF document text
    • https://cdn.sqhk.co/laxegipo/Miw3iiz/49998247411.pdfIn PDF document text
    • http://vokugomi.22web.org/1.10_segment_addition_postulate_academic_worksheet_answers.pdfIn PDF document text
    • https://safamitiwifiro.weebly.com/uploads/1/3/0/7/130739579/3cd333d8af8.pdfIn PDF document text
    • http://nokuxitajorox.22web.org/world_cup_2019_video_song.pdfIn PDF document text
    • https://guwamiludakubor.weebly.com/uploads/1/3/1/4/131453222/gebudulojab-bukidemivewopo-musamexasefo-pezepamukejivo.pdfIn PDF document text
    • http://gemotebefid.22web.org/lusazosavopuxi.pdfIn PDF document text
    • https://cdn.sqhk.co/mudaxomemut/1ifvgOZ/rapunzel_toddler_doll_disney_store.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472506/normal_5fd090378287b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xonowazibekaz.epizy.com/dedepejibaguko.pdfIn PDF document text
    • http://xapulena.epizy.com/pafexagegiraxev.pdfIn PDF document text
    • http://wafogaz.rf.gd/huntersville_police_department_crime_reports.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE3F 5340 bytes
SHA-256: 9770c95fad10ab4ef27f3c6f3109546379ae2d459f247746bfea525bf31ae386
font_01_sfnt_off0001103b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103B 10864 bytes
SHA-256: 384f3a84e16771421d1218534160749ef4b343aff69dafb7d0ad6ffde09c8585
font_02_sfnt_off00013586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13586 16672 bytes
SHA-256: 2d4141b2c3e0e1faac00cebb68b222a478cbf5b3021ccb83c2f2af212bc6ac65
font_03_sfnt_off00014c71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C71 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378