Malicious PDF — malware analysis report

Static analysis result for SHA-256 37d854acf713974f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-18 11:58:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 94d2fb8c9a9de6169068ba1ae854518d SHA-1: 8e944bbdc1bd818b147e321b95e88c886674abe0 SHA-256: 37d854acf713974fbebaec04410aed217a464ce4f4cc85df31b8fd0a08ce3878
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting and are part of a link farm. Heuristics indicate this is a phishing or malicious download lure, with ML classifiers and ClamAV strongly flagging it as malicious. The embedded JavaScript likely facilitates the download or execution of a secondary payload, contributing to the overall malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=gta+sa+android+mali PDF link annotation
    • https://www.alugutader.fr/ckfinder/userfiles/files/rejakikepitik.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/13271072843.pdfIn PDF document text
    • http://merlegdoktor.hu/tmp/67938671648.pdfIn PDF document text
    • https://vinaconexmec.vn/uploads/news_file/gotivap.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/68525302311.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/jomumirez.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/47673512375.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/fusevidigofa.pdfIn PDF document text
    • http://burattinojatek.hu/userfiles/file/verubadowolukepexox.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/fekowew.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/mavinagekiwekidivoxageva.pdfIn PDF document text
    • http://hqshop24.com/userfiles/file/27866977850.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/49647514362.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/69713340076.pdfIn PDF document text
    • http://methese.com/upload/files/lamafipuxadukenuvoragaze.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/71670730075.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/77969188518.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/safoguludikopipim.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/58934256116.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/xexufuxitabelosam.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f14b5ee689---jubugulerepepanazafetuw.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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 17132 bytes
SHA-256: 8f423658c47d7af3ee987589f641102fc630cdd8cd0d589c96269a9af5a12783
font_01_sfnt_off0000df51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF51 10316 bytes
SHA-256: 7503ed030bcde60df37179d11b155b0e9c42b887708361d6ef450f5fdc1af33d
font_02_sfnt_off0000f688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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