Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bc69a3eb8ebd270…

MALICIOUS

PDF

84.9 KB Created: 2021-09-19 07:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b624bbc34ce85da2375c6d725824381c SHA-1: 8c760084a9873109abf2fa718c93e89ccde41130 SHA-256: 2bc69a3eb8ebd270804aafe02d1fef614d17c88b0f7517401bdd453f2bb327a6
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links pointing to disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs further supports this, with one specifically targeting 'antifilter+for+android'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pistant.ru/uplcv?utm_term=antifilter+for+android PDF link annotation
    • http://maxbrio.kr/files/files/43855924500.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/zumopegigiduvawesidimi.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/33101553474.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/kodokurele.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/difuzizudumejubakuzan.pdfIn PDF document text
    • https://phucatgarment.com.vn/ckfinder/userfiles/files/pajokezaluzivadaxe.pdfIn PDF document text
    • http://realtor-madrid.com/uploades/fckeditorfile/zexixo.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/febidefonofolebumarewujuz.pdfIn PDF document text
    • http://ciba.lv/uploaded/file/nofomo.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/91605978651.pdfIn PDF document text
    • http://wdnederland.nl/file/divoninowemajidakonosijaj.pdfIn PDF document text
    • http://meetburgerusa.com/uploads/files/12339611956.pdfIn PDF document text
    • http://potlista.com/file/files/87671766304.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/konixiropidasufalitibuv.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/kekobabuxazunisalo.pdfIn PDF document text
    • http://webs123.com/userfiles/file/19019715486.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fokikakepiviw.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/zixejuxijudekepexidax.pdfIn PDF document text
    • http://atlonnuri.org/UpLoadImage/editer/files/vitetigimitebefitow.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/rebewoxunafanuloki.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/3918057363.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/buteboned.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/302496966.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/wixejiwukoluwutiz.pdfIn PDF document text
    • https://viceda.com/userfiles/file/17665356784.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bac8864eb---pobetaxovelifuzowademaze.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_off0000eacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 17296 bytes
SHA-256: 211823607a044415b05f6f9b43ef4ca4bd02b27723612c7e6790209b5b0b6119
font_02_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 10160 bytes
SHA-256: cfcb71e7facbb9d7dd895342c119bd7f47f056206ca336b94efa63e0f3472f8d