Malicious PDF — malware analysis report

Static analysis result for SHA-256 97409fa449f542a2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-10 22:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0834842e03a67f04ec3acf8d6b92499c SHA-1: ff3b6e79a6b3ed11b42587287e6572eb3bcd64b9 SHA-256: 97409fa449f542a2df8f813394c0dfc7c19c0a6011cfb9bd94836773bc6d7630
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://cructi.ru/uplcv?utm_term=nova+3+mod+apk+data
    • http://dubilex.com/userfiles/files/80963518274.pdf
    • https://dolmalatrek.com/userfiles/file/50518788004.pdf
    • https://adian.eus/files/galeria/files/kodelogafudi.pdf
    • http://flairpens.ru/uploads/file/36618707095.pdf
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138eb2a012da---34417692003.pdf
    • https://datatalk.ilvzhou.com/upload/files/2021/09/202109061017539487.pdf
    • https://getadoc.in/ckfinder/userfiles/files/30117910320.pdf
    • http://innersolutions-uk.com/file/30273973499.pdf
    • http://toflight.mobi/attachment/ckeditor/files/f9d9e7a5effc637804a11b225928a25b.pdf
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/38874100944.pdf
    • http://seattledesis.com/fckeditor/file/bilawipag.pdf
    • http://tongchangkj.com/uploadfile/file///2021090109022217.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/427198ceef141b27896decdd66e055bb/rerokabojupawefi.pdf
    • http://leasingtowers.com/ckfinder/userfiles/files/14999543545.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/jitumovobekoxa.pdf
    • http://avsa.org/sites/default/files/images/files/61461821272.pdf
    • http://animationcoach.com/userfiles/file/mipomulezepotawujal.pdf
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/97535483096.pdf
    • http://zamel2.pl/userfiles/file/49124114044.pdf
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/juwaremi.pdf
    • http://xn----7sbjvweekof5d.xn--p1ai/files/files/xanizulurugekepidifosa.pdf
    • http://ueros.fr/admin/ckfinder/userfiles/files/81737290272.pdf
    • https://sardavetri.it/userfiles/file/89836972136.pdf
    • http://mdsalon.ru/img/lib/file/xugol.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_off0000d893.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16792 bytes
font_01_sfnt_off0000f0a5.bin
0ab22ad2b18249cae78c3ea5283867648f815bac711014bc383acbbeace24d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A5 18412 bytes
font_02_sfnt_off00011fa1.bin
3ef23192c1d7ecc441f6b34f52afc6a0d56b6a07aeeb6d8eafe08e51c77ac971		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA1 10220 bytes

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