Malicious PDF — malware analysis report

Static analysis result for SHA-256 16bcb3729dccd622…

MALICIOUS

PDF

70.4 KB Created: 2021-09-13 02:03:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69d5382bc327add253ddde02df7e40db SHA-1: c70f5cf53677a65a199b84fa2bfb4b4ca04c4032 SHA-256: 16bcb3729dccd622aaed746a0b7d3f00304f7709206140cf49ebce06066c5b15
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The presence of embedded JavaScript, though not fully detailed, further supports the execution of malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://oniceh.ru/uplcv?utm_term=codes+and+themes+in+thematic+analysis
    • http://hotechike.com/files/files/binebajew.pdf
    • http://diagnosticaedilizia.com/userfiles/files/vafuxafipis.pdf
    • http://deltools.com/userfiles/file/79102928460.pdf
    • http://adwokaci-pila.pl/userfiles/file/wuretojigutikibivo.pdf
    • http://finchamauto.com/pics/47509435400.pdf
    • https://inprovitperu.com/ckfinder/userfiles/files/wonuvitafiwewojosi.pdf
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/75698687657.pdf
    • http://bndweb.nl/upload/files/diromaju.pdf
    • https://amatnieks.com/pictures/image/96826503067.pdf
    • http://tpt.taipei/asset/uploads/files/fejuvonunakuxudafitisi.pdf
    • https://portalbime.com/UploadedFiles/New/file/wofopitebijojepoxipun.pdf
    • http://etkenkalip.com/files/68370328905.pdf
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/37641692426.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/8f726900cf67ddebee18ccacd575aba0/87986856190.pdf
    • http://statsale.com/data/upload/ck/files/lasosajutitovavog.pdf
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/marurekedo.pdf
    • http://www.cda.org.hk/ckfinder/userfiles/files/46743801617.pdf
    • https://smg.bid/ckfinder_userfiles/files/sodukatiwazekenipidijip.pdf
    • https://commonwealthsportsawards.com/userfiles/file/nedejawuwuvuzitutulozesa.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/3024e2c2135bdbba8fdb2bc50b81095e/fewonitorejixupivog.pdf
    • https://fsbulletsandbrass.com/userfiles/files/moralefowixala.pdf
    • http://happy-land.hu/editor_up/berijib.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/tawejabazuwalogigu.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_off0000b4f3.bin
2cf95b35fb93fc7a684bcca7260641ee38943b86b573afeb3676103ecac0410b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4F3 10680 bytes
font_01_sfnt_off0000cd46.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD46 16792 bytes
font_02_sfnt_off0000e558.bin
edb483d0f333ea05e4f413905a0b33ba26d293ebfbac617e1f3795a5e3721df4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE558 15124 bytes

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