Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35e4678b04d8e19…

MALICIOUS

PDF

82.6 KB Created: 2021-09-10 10:15:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1e0e5b39747cb6d8656e216839643770 SHA-1: bb8e022e332a8675b1b7ea3cff0ef02c55f56424 SHA-256: f35e4678b04d8e190b0766c66cf32419063aa7cdfb34231001239819ff025a4e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external URIs, with one specifically pointing to a URL designed to lure users with a search term related to data transfer. The PDF's structure and the presence of many links suggest it is part of a link farm, likely intended to redirect users to phishing or malware-hosting 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://drafthe.ru/uplcv?utm_term=transfer+app+data+between+android+phones PDF link annotation
    • http://marsalanoleggio.it/userfiles/files/20883010718.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/53367228111.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/39740695310.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/bolomobasixuroraz.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/44120668085.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/39611284934.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/mofijonemikamilagug.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/dawav.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/64375218463.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161306a97919c1---16196528985.pdfIn PDF document text
    • https://autonoleggioassereto.com/file/51124514081.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/67392673686.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/juxuwo.pdfIn PDF document text
    • https://yocarbroker.com/upload/ckfinder/files/mowapude.pdfIn PDF document text
    • https://planningpvedh.nl/ckfinder/userfiles/files/zetod.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/f7f3c92c1ab60908e512af373d931c38/fenabalewujuwek.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/vogodej.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zutosisomifomamoguw.pdfIn PDF document text
    • http://fteq.ru/files/file/bonijovufiw.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/82989369589.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/sutojiz.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/bexegusubisexutuwopubutal.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/zajutavuzamefo.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_off0000dc08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC08 10736 bytes
SHA-256: e37cf1a874bd092836416e2dc51d511e274ea8e5b6cbdc03998bc5ae65d570d2
font_01_sfnt_off0000f479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF479 18384 bytes
SHA-256: 14ceedd9d981bd6d16cc51631c97c8b0616735f54184b9e0445bcde1b4bc3fc7
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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