Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff5b3faaac781dff…

MALICIOUS

PDF

71.8 KB Created: 2021-10-02 09:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 497d7708566f9504de7dd96fa3336adb SHA-1: fed1d48fa03730d19c9e571bd598329ed0fbe2e6 SHA-256: ff5b3faaac781dff698a425cb83a933880936553148d8380c99249b937b6a3aa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, indicating a link farm or redirection scheme. The presence of external URIs and the overall structure suggest an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.polni.si/Images/files/kililixezozapuko.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/96633899046.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/parokexiza.pdf
    • http://stlukesfp.org/ckfinder/userfiles/files/15698221875.pdf
    • https://calendarsunrooms.com/userfiles/files/71123091067.pdf
    • https://perfectprojects.ro/userfiles/file/97641969860.pdf
    • https://bisnismedsos.com/userfiles/file/49068077743.pdf
    • https://oxi-dental.ro/imagini_ws/pipopogubixirajalibakoga.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/dovejufejevowosokobuf.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/20232249010.pdf
    • http://otoozevran.com/resimler/files/mugerebuxonawegajebaralox.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/berodolilokitabemi.pdf
    • https://markmont.eu/editor_uploads/system/files/wokeg.pdf
    • https://danielstrehlau.com/userfiles/file/8241245647.pdf
    • https://xehowo24h.com/images/ckeditor/files/49914011567.pdf
    • http://fthyhs.com/resource/docContentImg/file/2021-09-03/51b884b8a1a6cdbe24eb8f4302e2f12a.pdf
    • http://php-lounge.de/userfiles/file/bisobekagemupebibisoxoji.pdf
    • https://webrobogo.hu/kepek/20829290237.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16155c0b500db1---80196989003.pdf
    • https://ontogepszerviz.hu/editor_up/87880965237.pdf
    • http://architettoangeli.it/userfiles/files/13305117068.pdf
    • http://prime42.ru/userfiles/files/35537881511.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=find+the+nature+of+roots+of+quadratic+equation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b316.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB316 16792 bytes
font_01_sfnt_off0000cb2d.bin
7ec286e0df8988127a5383fc7fd24bb417d937a866d2888d80bdf92df31d6896		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 10748 bytes
font_02_sfnt_off0000e397.bin
4e66723d0df9bac6047e8d72c24de4081edd11ccaa52388e4a190b81417c738b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE397 17416 bytes

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