Malicious PDF — malware analysis report

Static analysis result for SHA-256 8466b7940e6d2b01…

MALICIOUS

PDF

86.7 KB Created: 2021-09-20 12:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a07e325dd52e486586ee26d574a8ff03 SHA-1: a31e9a4abd47f47299a26bdf1bb1207ee9dc428a SHA-256: 8466b7940e6d2b01f16dcdc20e8251cdf8226db177c89a8b814dc189583153f8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. The presence of these links suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

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://infrive.ru/uplcv?utm_term=janam+tv+live PDF link annotation
    • http://bakoca.hu/files/file/durafafo.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/67369097009.pdfIn PDF document text
    • https://satesayap.com/contents/files/20594912751.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/85358784913.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/19511385430.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/xoxavisuf.pdfIn PDF document text
    • https://hetodon.com/fckeditorfiles/file/99717040836.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/33138208482.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bisitulobowawolivixuzuseg.pdfIn PDF document text
    • https://shreegroupco.com/userfiles/file/49114940178.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/77158070902.pdfIn PDF document text
    • http://apicn.net/upload/files/27174739824.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/runemazutavodagowalo.pdfIn PDF document text
    • https://altsovmun.ru/userfiles/file/polamukoxavexag.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/kapisenoliletidumomuker.pdfIn PDF document text
    • http://machinesupplier.cn/data/product/file/2021918_18330_766.pdfIn PDF document text
    • http://pferdplus.at/sites/pferdplus.at/files/file/48224085324.pdfIn PDF document text
    • https://998.geektic.com/geektic/files/siziruvek.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/34167260698.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16145635754e68---95891920307.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/99290321646.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/bf1ad6cd27e5713fff8a18fb85b3b9fc/71023494313.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/67320298518.pdfIn PDF document text
    • http://restauraceeverest.cz/userfiles/file/vevovijivixusogedi.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/xosugexumixejipiko.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_off0000ed7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 9936 bytes
SHA-256: a7bb74aa1a28a5236e98181edac06fcf8586bb8e6eba42aaec4f7ed09269eaae
font_02_sfnt_off00011b7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7A 19028 bytes
SHA-256: 9f1a7d216fbf5d580f9a18491a6ec04d7ec6d0b8d159eff8fe9476399d1b0d50

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