Malicious PDF — malware analysis report

Static analysis result for SHA-256 c158210809f0a473…

MALICIOUS

PDF

74.1 KB Created: 2021-09-20 05:01:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 84a21470f0e44fcae87b3d74ee18165b SHA-1: 253a6c121931e7c68d166cfc698a2bd68b169bfc SHA-256: c158210809f0a473ead540bcfb95e9a9630926a6855e93a3907fe02c988233d8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs pointing to disposable hosting, indicating a link farm designed to redirect users. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign or a distribution point for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://chcial.ru/uplcv?utm_term=fs+14+mod+game PDF link annotation
    • https://audreyheselmans.com/_files/file/tofabepinozewuxegitaw.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/10044303359.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/18928974045.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/47956166105.pdfIn PDF document text
    • https://krusomying.com/data/file/desilewaganitijuk.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905143312693353.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16143d8ad44d7c---65629793081.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/26898572713.pdfIn PDF document text
    • http://ukkies.be/userfiles/file/82795192236.pdfIn PDF document text
    • http://aquitaine.annuaire-regional.com/ckfinder/userfiles/files/togazawowigoletotuba.pdfIn PDF document text
    • http://innotack.com/userfiles/files/darulowu.pdfIn PDF document text
    • http://viorina-deko.com/images/file/lafojeluwu.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcdc9d0c7---57784646982.pdfIn PDF document text
    • http://sromedical.com/file_media/file_image/file/60714579177.pdfIn PDF document text
    • http://chhattisgarhsanskritboard.in/sharpinstitute/images/files/58931158373.pdfIn PDF document text
    • http://nfc.soo.jp/file/40593784368.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/didixiliwabegire.pdfIn PDF document text
    • https://akconta.com/uploads/files/genuluxarexemebewuzavagak.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/51624699938.pdfIn PDF document text
    • https://norservis.cz/files/files/21737827915.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/4615733439.pdfIn PDF document text
    • http://vnndt.com/Images_upload/files/batudurigimazexofovet.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_off0000bff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFF0 17168 bytes
SHA-256: c9df82df6f8f8547ab5ecf2cb99fdcb2b7ce0f22c1fb48c0d8f6f23c50e7be6c
font_01_sfnt_off0000ec1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10432 10260 bytes
SHA-256: 2e67a46dbd5a7d61296a474443d7a4a7b07e78e62b1f753ddf256de3bfaaebdb

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