Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79b817c2ba3e291…

MALICIOUS

PDF

70.2 KB Created: 2021-09-29 01:56:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ff0e2bbb3ea6f9ffc9274d2a5ea60c6 SHA-1: 5c4923115d2fcf3187cc8368d45b21e177243a33 SHA-256: d79b817c2ba3e291d30f28a103e55d59514b0dad5a4f1688512e43c0c4218c4f
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct hosts, many of which are associated with PDF files. The presence of external URIs and the overall structure suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://postelezmasivu-zlin.cz/ckfinder/userfiles/files/fusajaxopowufiw.pdf In PDF document text
    • http://location-venise.com/italie_documents/files/pumujawu.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/96770691607.pdfIn PDF document text
    • https://printjet.pl/pliki_user/File/53066462931.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/84031221417.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/pivotijeduxax.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59287084804.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/66336095280.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jisumakupifukufano.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/lorigibejerimovoge.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gosonumebunigiribawenixaw.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/3106627609.pdfIn PDF document text
    • http://erex.hu/upload/file/46019378145.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/36496908897.pdfIn PDF document text
    • http://robvancampen.nl/userfiles/file/rinomojoruw.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/bidudikotifa.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/pekexekifus.pdfIn PDF document text
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/zevarekote.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/diwururojotopirekuk.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/kukam.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161367e810d4df---77250684528.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/jisivasagegopufitedem.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161400edd66b08---butavumajibutad.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/23206244012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=cr+hack+mod+apkPDF link annotation
    • 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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CA 10264 bytes
SHA-256: 137be2f65ac07ee1a44f19a7cb38259e28a4cf73ceba7feb27db16a00b411a1e
font_02_sfnt_off0000dfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD7 16484 bytes
SHA-256: 641d9a2cda63a687f7bd1d5c77ec789ef4d06928b4fc8d4d17f0b28aaa8a5e35

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