Malicious PDF — malware analysis report

Static analysis result for SHA-256 46d635adacd194c6…

MALICIOUS

PDF

84.8 KB Created: 2021-10-14 15:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fadd546b285c36c5dca1a18c7419b63a SHA-1: eeb8f8f90978e9799050d5cc8df9ac128b6afb14 SHA-256: 46d635adacd194c639d87b8254a55411fa2d9504fa52bc647a451601620cbd11
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • 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.
  • 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://drafthe.ru/uplcv?utm_term=the+conquest+of+space PDF link annotation
    • https://preciseenergygroup.com/media/34110407820.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/usf/files/xadufuwusivupewa.pdfIn PDF document text
    • http://torby.kbo.pl/ckfinder/userfiles/files/31846810300.pdfIn PDF document text
    • http://mizuho-co.net/file/ck/files/zejomotigeku.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/difekokipiwemikuxibo.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/98678461400.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/10074339794.pdfIn PDF document text
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210917020243.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/21512760709.pdfIn PDF document text
    • http://sun-tes.ru/files/file/27561049760.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/ropewapomajedisugosuko.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/bomizupolizetonutowiwiv.pdfIn PDF document text
    • https://magerp.org/upload/files/19277936004.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161342b114e1d1---diruwatiripemosowu.pdfIn PDF document text
    • http://cnispgroup.com/filespath/files/20211012050931.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/agoxaxilowemobevaze.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/venag.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109070908309552.pdfIn PDF document text
    • http://salkim.com/userfiles/file/27755522709.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/5348255326.pdfIn PDF document text
    • https://lixtech.com.tw/ckfinder/ckfiles/files/kolaruzu.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/mabeje.pdfIn PDF document text
    • http://cochemical.com/upload/files/jidedufonumubog.pdfIn PDF document text
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/50562565778.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_off0000e4a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A7 18772 bytes
SHA-256: b41fde19d6caf2370db32e6768dc7cdcf5cc589d9f8edc5b7c5eb1150cd60f7b
font_01_sfnt_off0001153f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153F 10548 bytes
SHA-256: 4a0ff560786fbae44b76262340ed9c53ca8af8722aed0e747a671c70cd58161b
font_02_sfnt_off00012d49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1