Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73f3391e691c122…

MALICIOUS

PDF

81.5 KB Created: 2021-09-24 11:45:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 52edf89def8e3555acd790d320f557ae SHA-1: df163ee7e90dafe8facfd411252da1f4e07e57a0 SHA-256: d73f3391e691c122b006d5b15dd97988fbfbba234e21d69f4a8b735a910b0a99
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains a large number of embedded URLs, many of which point to disposable domains and are structured as a link farm, suggesting an attempt to direct users to malicious content. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/noxobevo.pdf In PDF document text
    • http://bidadapatidar.com/userfiles/file/kotikebalokebanizefe.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/genanuwetodajijovi.pdfIn PDF document text
    • http://mobiliteit.nu/files/jefagidovalipabadof.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c7ef8180ef9262d997d34e9e6f56351/52324442319.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/paginilowiruxafomev.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/febogudepavoxupano.pdfIn PDF document text
    • https://masihpt2.com/contents/files/repexonulatuxabuxoga.pdfIn PDF document text
    • http://sibzakon.ru/ckfinder/userfiles/files/vufesa.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/23083671364.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/dalek.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/67231150045.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/wekodojawupasijifaf.pdfIn PDF document text
    • https://tedesco.pl/userfiles/file/71026938276.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/68189726415.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210907_C06B5A1DF3C8C2AA.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/53643735785.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/99401395292.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/68159462419.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zapemelupimafod.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/jamomemunodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=download+legend+of+the+phoenix+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_off0000d841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF053 18096 bytes
SHA-256: c2c0948a39470432e0a858fe97b7df5b1ad8bb4e5adaf230caf50353b52de1c2
font_02_sfnt_off00011f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F09 10956 bytes
SHA-256: 917cca118202647dd6e618656c996585409bbb3e7d9486893dbf5f3a5c2e2838

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