Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f2a778f63aa709…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 22:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cf62125c84bc0d3b1f44de1b2a79f506 SHA-1: 7c5f840f5c607bb3dc018c3d064038ea9bceb0c3 SHA-256: e8f2a778f63aa709e185535b801055eb47d797d14530def3fd1074614568e15b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the document is designed to redirect users to potentially harmful websites. No scripts were extracted, but the overall structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 5

  • 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 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://laborke.ru/uplcv?utm_term=steroids+vs+non+steroid+bodybuilding PDF link annotation
    • http://actybrain-consult.com/Upload/files/89341081823.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/37613241685.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/36874807507.pdfIn PDF document text
    • http://encino.ilovepokebar.com/uploads/files/6776302702.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/81855920015.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16132e66eafddb---nowefasil.pdfIn PDF document text
    • https://immobiliareincentro.it/allegati/file/97014417629.pdfIn PDF document text
    • http://ambvetfanini.eu/userfiles/files/13200066208.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/gonuxavapu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/91502530603.pdfIn PDF document text
    • https://labelmarket.eu/data/file/27944016484.pdfIn PDF document text
    • http://kossuthdigisuli.hu/userfiles/file/58841181197.pdfIn PDF document text
    • http://rubella2.integra-sh.com/userfiles/file/logigazepuwigozetozesub.pdfIn PDF document text
    • https://pjkconstruction.ca/images/file/41730012011.pdfIn PDF document text
    • https://livres-arts.com/ckfinder/userfiles/files/ruloli.pdfIn PDF document text
    • http://enjoybowlramenandpoke.com/uploads/files/fikezakifevigulirir.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/72186337712.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/xekeporij.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/baxesutejojenabobigulote.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/60463272894.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/7745ecba5a12b8c95b7a6642860ce083/jojoma.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/memijipuleg.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139852b05f07---wejabujife.pdfIn PDF document text
    • https://njshore.drinkpoint.com/uploads/files/60476944942.pdfIn PDF document text
    • https://miraclechuppahs.com/userfiles/file/97228337126.pdfIn PDF document text
    • http://vikingpaint.com/user_file/file/75923994165.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://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_off0000b60b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB60B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1D 16344 bytes
SHA-256: 0bf8d4d841f691204f3f855fd7a2123eb0fcb27a53505bd33585d824b75790f8
font_02_sfnt_off0000f7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A0 10756 bytes
SHA-256: 6134cb5f78959650ad81799ac0ddba2ae0ad23b26a754a2f8bfe56b18468b0eb