Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e72564e5f65be68…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 20:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d6b17bf60cf2a6ca81e1778fb4f0d674 SHA-1: 5b4efb386d17897195af722d07344cec0b97833e SHA-256: 7e72564e5f65be685f8ef693260e0de8e807d59edf0f3d85fac3df46fcfc3ea0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF 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 domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://eia-edu.com/userfiles/file/wazupuxuravudoratug.pdf In PDF document text
    • http://galsabino.it/userfiles/files/12768515101.pdfIn PDF document text
    • https://finliz.lt/i/File/kojaxekokokuvam.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/kivifenef.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/42606665014.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613422d0afb6d---61992201764.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/21938743611.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/11621767398.pdfIn PDF document text
    • https://gretajensen.com/ckfinder/userfiles/files/23483533963.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/54128982906.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2a6b94872dfb1b3c501542354b133da0/21470218985.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/files/sesutajomiwojidotuwux.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/17211534743.pdfIn PDF document text
    • http://pasted-radio.de/web/files/kagarufirewilavij.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/xiligetevikoji.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/30828708747.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/ludosofawik.pdfIn PDF document text
    • http://trungnguyenjsc.vn/uploads/image/files/limabegozorefuzepipaxetu.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/14643627566.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/26801942148.pdfIn PDF document text
    • http://xedaptheduc.net/app/webroot/uploads/files/gakebowowononuzenuluwa.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/77987713730.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=hogu%27s+love+watch+onlinePDF 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_off0000bc70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC70 10688 bytes
SHA-256: 267d1bfaf27072017c74f85024251dd0a4c14dc200c6f55f097277952588a098
font_01_sfnt_off0000d4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FF 16536 bytes
SHA-256: 90f7929ee11a1cf1de346b5a95bfe9ecafa389f2e4052a2c352e5355d96480f5
font_02_sfnt_off0000ff15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1