Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec7ad383a15444f…

MALICIOUS

PDF

87.8 KB Created: 2021-09-08 13:37:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd17b029f0a79e0ed91ac8385d71c30e SHA-1: 132dd2465d060c53a3184f958463f59d2f7db6d5 SHA-256: bec7ad383a15444fabd0d0857dfb8e1ea4b9fe97a7a6dab448432bcda3cbb46d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://oniceh.ru/uplcv?utm_term=multiplica%C3%A7%C3%A3o+de+matrizes+exercicios+resolvidos+pdf
    • http://cbestdesign.com/ckfinder/images_store/files/88015448521.pdf
    • http://agedwedfjtj.pretty-match.com/upload/files/zopofepazi.pdf
    • http://vit-physio.de/file/lumamufesika.pdf
    • https://alutat.com/data/file/lurilasemewe.pdf
    • http://dpnovelty.com/upload/files/wuzis.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/45239455057.pdf
    • https://twr1115.net/files/fckeditor/file/zafejerotigafigosekuw.pdf
    • http://ilksolar.com/Images/Media/files/nomorisume.pdf
    • http://stisk.com/file/97768795685.pdf
    • https://dennismaloney.ca/upload/editor/file/wulezuge.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/pamusuzanamipulowumol.pdf
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/guwatuvipudemewunowitoge.pdf
    • https://cowichanseniors.ca/userfiles/file/49385183415.pdf
    • http://isystem.hu/userfiles/file/pomiw.pdf
    • http://collectifff.be/imgdb/accueil/files/mobusewisizadebu.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/nikafepezodipilaxonarule.pdf
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/woxuvidexivabo.pdf
    • https://goodline.by/userfiles/file/55086316077.pdf
    • http://samnakthodrahassob.com/userfiles/file/mubopom.pdf
    • http://mariamozharova.ru/uploads/files/64097871714.pdf
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/fulowovezibar.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6b9.bin
3786176f0d8b6450f94180c098573817bab23a9d8f0a3327d02a64c4fa78701b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B9 21220 bytes
font_01_sfnt_off00011c10.bin
ba55b03e785d82817d1180f1fa5d27ceaf92a21ffa34827b17d15c07e9e9a469		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C10 11464 bytes
font_02_sfnt_off00013696.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13696 16792 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.