Malicious PDF — malware analysis report

Static analysis result for SHA-256 3931c7488f3add52…

MALICIOUS

PDF

84.4 KB Created: 2021-09-13 10:44:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 25e63e926f2e41ee9dd7f3c648efdd00 SHA-1: eadd874f9f425afe72d51ad44ecba70bdf168897 SHA-256: 3931c7488f3add5274527bfe7addea261add93459e543162548315d3e11dd68a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically flags this behavior. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://coretry.ru/uplcv?utm_term=beautiful+android+games PDF link annotation
    • http://ebrinteractive.com/userfiles/file/zawofilubowonadu.pdfIn PDF document text
    • http://medwin.kr/userData/board/file/pufenekajolas.pdfIn PDF document text
    • http://foodchemsino.com/d/files/27133729197.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/logorafur.pdfIn PDF document text
    • http://360global.ca/userfiles/file/kobonelukepokifigowu.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/jefitadobelapazujav.pdfIn PDF document text
    • http://iweldbot.com/ckfinder/pho/files/81861132162.pdfIn PDF document text
    • http://duancanhotot.com/upload/files/kisomapajakixeluka.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/75468586200.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/81200001717.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/69613329152.pdfIn PDF document text
    • http://icsbc.ru/fuploader/file/rosokopitixa.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/nozuvimun.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/mipumojonewas.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/gefij.pdfIn PDF document text
    • http://mosjob.ru/images/file/zerekenujutef.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8c299688be517508376d2b98576002e2/gokiduwaxipeleguwumedu.pdfIn PDF document text
    • http://vasekurzy.cz/userfiles/file/vimetipoke.pdfIn PDF document text
    • http://ser-buk.com/userfiles/file/gadepuvudimadela.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/72951320778.pdfIn PDF document text
    • https://rcvizovice.cz/ckfinder/userfiles/files/69197669869.pdfIn PDF document text
    • http://amkchem.com/upload/files/jusexumubofububek.pdfIn PDF document text
    • http://sportingfoundation.com/uploads/file/82499969993.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_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 17248 bytes
SHA-256: 0e4029c31c76530b23af2c19f85cf84b91e3e9af862f373c5a472f86c903b732
font_01_sfnt_off0001131c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131C 10848 bytes
SHA-256: f868fe59d6a09a6acf8d705e21fa2ce1d93350631a678cd096d2f33d72c59eb8
font_02_sfnt_off00012be7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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