Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd61e3abb783bec1…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 15:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6bcf09825e5633277d7e4767b733339 SHA-1: 5d9ddf3043075171fea8a6ee75d40496af95a1c6 SHA-256: cd61e3abb783bec117a4374e1a044a3b52042ace972f6d789b7fce7e8a382210
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a potential phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tuinvandecruys.be/file/82486273418.pdf
    • https://rkdestate.com/userfiles/file/fujefujirafofofofu.pdf
    • http://ecogestval.com/userfiles/file/tezexe.pdf
    • http://rubensova16.cz/files/file/53743508344.pdf
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/notutajiworagok.pdf
    • https://hediyelikhanem.com/calisma2/files/uploads/47791525616.pdf
    • https://quangcaomattroi.com/uploads/news_file/84958703624.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/42a9450fd325855a5d96a010be1d8a5a/49437403626.pdf
    • https://accu-split.com/userfiles/files/gowotile.pdf
    • http://frankifoto.com/uploads/pages/files/lerisexumuzopegabajijas.pdf
    • http://sprinter-lab.ru/content/File/gibujujufezepa.pdf
    • https://tl-systems.hu/files/files/27223789195.pdf
    • http://china-zub.ru/userfiles/file/11942797733.pdf
    • https://metnar.pl/web/uploads/files/wijusinagaroralexemejob.pdf
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbe741952d---35513727957.pdf
    • https://karpzbeldowa.pl/uploads/userfiles/files/60858169655.pdf
    • http://biosafety.biz/ckfinder/userfiles/files/vopizibevudewotemi.pdf
    • https://cingenito.ca/upload/editor/file/wugozutilase.pdf
    • http://agt.es/files/galeria2/files/92117551338.pdf
    • http://luijkzonwering.nl/image/file/34908248096.pdf
    • https://renebeumer.nl/userfiles/file/65078875849.pdf
    • http://isdoor.ru/uploads/files/rolisemavinaduvixa.pdf
    • https://egokituz.eus/files/galeria/files/2199990678.pdf
    • http://chargooshads.com/images/upload/files/81410976544.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=clicker+heroes+modded+save
    • 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_off0000bcae.bin
7897b35d1a0d047abe1a469f2598ae64750ea2bd978d757f6f4e174e1e190669		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAE 10624 bytes
font_01_sfnt_off0000d500.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD500 16792 bytes
font_02_sfnt_off0000ed12.bin
a4313cc67918b01f1a80aa7770515591f1ef11baa4f82d4e5281132bc6c52548		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED12 15968 bytes

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