Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9944fde6940e1df…

MALICIOUS

PDF

72.6 KB Created: 2021-09-09 12:23:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62f8fbbd39c3ed914b27626e75367140 SHA-1: 8577fe7b57c2ac7a261566ef332db84adde5afe7 SHA-256: a9944fde6940e1df4576a6b04a54fb62dcaf4d8089fcf177465c7751d7d8462c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a significant heuristic firing indicating it's a link farm on disposable hosting. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zuwafadegugovov.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/66408642423.pdf
    • https://scavilecis.it/userfiles/file/15052688038.pdf
    • http://galeriejacqueselbaz.com/userfiles/file/74985848229.pdf
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/jobuzixowu.pdf
    • http://reichspfarrer.sk/file/tomojakejesizixetemixup.pdf
    • https://stauber.lt/images/files/pilezu.pdf
    • https://gfwofficial.com/ck_imgs/files/36022983156.pdf
    • https://bunianco.com/other_files/File/lademogo.pdf
    • https://webrobogo.hu/kepek/vakefajosixe.pdf
    • https://equimat-cheval.fr/file/debadokuzaniz.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/mujadelole.pdf
    • http://gleb777.com/fck_upload/file/67220785913.pdf
    • http://rana-international.com/userfiles/files/mukofibowekiramivuvu.pdf
    • http://ldkxzzs.com/images/userfiles/file/26638921344.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/mr6i790mtllp7hp9caadmqh4d2/24065013065.pdf
    • http://ranaghatpchsschool.org/userfiles/file/wimufavugage.pdf
    • http://eastindiaspray.com/suvra/eastindia_spray/files/gefifoximexigaf.pdf
    • https://lemarko.com/userfiles/file/jumumesudaranenaribibepo.pdf
    • http://atamergranit.com/userfiles/file/664182423.pdf
    • http://almar-bus.pl/userfiles/file/risubasalijoxineroviliraf.pdf
    • https://nezrenpin.com/calisma2/files/uploads/73673163379.pdf
    • http://www.rpv-drachten.nl/files/file/22667453761.pdf
    • https://www.kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/sozepulabujebutezez.pdf
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/7333914514.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=android+emoji+vs+iphone+emoji
    • 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_off0000b98c.bin
8a6c1ef3c42ae1bf563eeb6fac9160934f361fcaf26b93267d6db668b402bad7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB98C 17224 bytes
font_01_sfnt_off0000e52d.bin
d427111c064a656b1939b78559d51bbeac640a04457acb7d212a6a603968d2a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE52D 10528 bytes
font_02_sfnt_off0000fce2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE2 16792 bytes

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