Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a13c072cb97975a…

MALICIOUS

PDF

77.7 KB Created: 2021-09-20 17:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98391fff29fcd7093db39866053d36af SHA-1: ed598294474c793989513147876303517c5e096c SHA-256: 4a13c072cb97975a6e7342cf027b4a5d0b4531931eb7eec196fed2cbf193ed49
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of embedded URLs, many of which point to disposable hosting, suggesting a link farm or phishing lure. The authoring application 'wkhtmltopdf' and the presence of numerous external URIs are consistent with the creation of documents designed to redirect users to malicious sites.

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=chal+mera+putt+2+hd+full+movie+watch+online PDF link annotation
    • http://khyljg.com/uploadfiles/files/tanudujodowubowe.pdfIn PDF document text
    • http://philipp-haberland.de/images/upload/file/minunosoguwogagodeti.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/62181120133.pdfIn PDF document text
    • http://fszhenjia.com/upfolder/e/files/20210918101540.pdfIn PDF document text
    • http://garderoba.sk/images/_file/kovapaleg.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/pedijizidokado.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/53051257598.pdfIn PDF document text
    • https://plagij.at/ckfinder/userfiles/files/fenelorexeludule.pdfIn PDF document text
    • http://www.yevres.fr/ckfinder/userfiles/files/zodidukivowob.pdfIn PDF document text
    • https://reformedgeneration.com/userfiles/file/70733365235.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/80773096158.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210901_203009.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/60533731846.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354722512e---nomujisedovotib.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/gafonodipub.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/gigirujunotozonikoladag.pdfIn PDF document text
    • http://materialdeestudo.top/userfiles/files/firug.pdfIn PDF document text
    • https://stopserv.ru/files/file/44748493216.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/96486769749.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/98087788950.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/jisodebatixufenazupo.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/93220899665.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_off0000ca05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA05 11120 bytes
SHA-256: d8d0e68b6f35235d4a71e6a9f0b051ba38c456122125227c8e7fcced3d6b325a
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF0 17424 bytes
SHA-256: 64830d5cbc7a93f8d0093b0692a1d824fb4edf6265ddbade0f07ef36876f52fa

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