Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9920893d348a52f…

MALICIOUS

PDF

84.0 KB Created: 2021-09-22 23:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 782458307bfe170805161123e53345b7 SHA-1: 40728c6f0d5ea56e0e974dfaf6d12d38eef16554 SHA-256: a9920893d348a52fe0f42a87fdc8bb54377f0787bef415969bb12beae4be58c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness.

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://crewmak.ru/uplcv?utm_term=facebook+integration+in+android+app
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/4436776b63db5c1fc89538c4a8fa4f99/65442233771.pdf
    • http://freeski.hu/freeski/file/36609047426.pdf
    • https://ipekyolumedya.com/resim_galeri/file/binovobakuziwanimovuneda.pdf
    • http://gardens-spa.com/user_pict/file/49189132549.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/30621527338.pdf
    • http://booklandbooks.com/userfiles/file/16210543582.pdf
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/xuvuwipejoturirota.pdf
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/72041038840.pdf
    • http://tortsurprise.ru/upload/redactor/files/76863859249.pdf
    • https://educationindiajournal.org/ckfinder/userfiles/files/jilibawiropo.pdf
    • http://ahknchem.com/upload/files/waxeraretodonafatot.pdf
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64712258690.pdf
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/sipanote.pdf
    • http://thepokewave.com/uploads/files/80926260424.pdf
    • http://fabrikando.com/cmsimple/images/file/takemerabuxuwidilegiwa.pdf
    • http://qdsenfeng.com/data/files/ximorasisinob.pdf
    • http://stonepigments.com/userfiles/file/91117915018.pdf
    • http://de.ruben.pl/ckfinder/userfiles/files/busutiwinusozux.pdf
    • https://gmnavarra.es/ckeditor/files/tewirux.pdf
    • http://angelofthewinds.org/ckfinder/userfiles/files/68420444940.pdf
    • http://randoquad72.fr/userfiles/file/71679974723.pdf
    • http://seoulsquare.com/userfiles/file/sulasujinewuzezud.pdf
    • https://kingwrapcarspa.com/upload/files/9305298438.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613621aa7be3a---22990086597.pdf
    • http://stringquartet.biz/web/images/fck/file/2709090673.pdf
    • 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_off0000e4aa.bin
7c79dd95129644912e3e68782b34e6752d6bdd243a6cc79cf5907c7086649741		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AA 17604 bytes
font_01_sfnt_off000111f4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111F4 16792 bytes
font_02_sfnt_off00012a0b.bin
b205b525eb82188bc1bacd28dafd7745d414c8c1aa611a2a3e109443ce4bd7ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0B 10684 bytes

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