Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3aa07f18731704d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-29 14:27:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 187fab0d89ddd9fafd7ebceb7b591056 SHA-1: a8b604dc9b997d081fe079bda45235cc0fcfbcda SHA-256: a3aa07f18731704d231c2365e614d3616260b19b010e56720f544295747ae460
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. It contains numerous external URIs, including a link farm heuristic, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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=harry+potter+and+the+order+of+phoenix+pdf PDF link annotation
    • https://khangle.vn/uploads/images/files/dinezevupobapogabip.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/fefomexu.pdfIn PDF document text
    • https://ssekolkata.com/ckfinder/userfiles/files/bagivezozanixenak.pdfIn PDF document text
    • https://aquamedicasatumare.ro/ckfinder/userfiles/files/sijozogutav.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/89215708797.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/sulesubegigemamonogege.pdfIn PDF document text
    • http://auto4-spb.ru/public/images/ckfinder/files/83039604856.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/64135919422.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/gumanuduv.pdfIn PDF document text
    • https://buka.ru/sadm_files/bopudatofidalodojuxowe.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/b850771bbe55a3d495ed981aa3098829/78870113855.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/28557419818.pdfIn PDF document text
    • http://cuatro-pr.org/sites/default/files/file/vudaputupugekil.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/zufitazavijugodomilodovov.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/jamakemos.pdfIn PDF document text
    • https://kingbakerypans.com/userfiles/file/21043467205.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/42833416345.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/rizobi.pdfIn PDF document text
    • http://bidwoodmachine.com/d/files/fusip.pdfIn PDF document text
    • https://birudongker.com/contents/files/80565256801.pdfIn PDF document text
    • https://venus-forever.com/image/files/werikigo.pdfIn PDF document text
    • http://email-database.info/userfiles/file/gokatesefosomi.pdfIn PDF document text
    • http://iact2001.com/userData/board/file/71472783719.pdfIn PDF document text
    • http://dkkarsin.pl/img/upload/files/82907873004.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_off0000b2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CA 16032 bytes
SHA-256: 140dfdf057d88a2b489bd2d32634a42e637a7fce6d747ed64d5921ba0396d39c
font_01_sfnt_off0000dbec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEC 10588 bytes
SHA-256: 3ba9dd7f80e6c3d61eac01309d636de07268ffcfd3fa6d343ced90d6131ac27f
font_02_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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