Malicious PDF — malware analysis report

Static analysis result for SHA-256 21273cd0deda8dcb…

MALICIOUS

PDF

78.1 KB Created: 2021-09-18 21:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84505fd82cef22fac3b6501e757c28f2 SHA-1: 8f179d5c50744b8173331de14fd159d6c7f36621 SHA-256: 21273cd0deda8dcbb6cbd2d2bd203ed21ae8230fca37ffec67996c187e703854
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which appear to be part of a link farm designed to redirect users to potentially malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the final destination, suggesting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://krisoc.ru/uplcv?utm_term=ket+speaking+test+cards+pdf
    • http://spakimthi.com/upload/files/5907363324.pdf
    • https://ijp2.com/contents/files/86641237818.pdf
    • http://gaziogluenerji.com/images_upload/files/tanoj.pdf
    • http://slesnick.net/userfiles/files/66896712593.pdf
    • http://daechienglishpark.com/ckfinder/userfiles/files/temuzozozuxisawela.pdf
    • https://mehfermobilsaglik.com/userfiles/file/66237854387.pdf
    • https://armenia4d.com/contents/files/31785610944.pdf
    • http://hyunshin.net/userfiles/file/15955282615.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/76665694108.pdf
    • http://ferramentabelleggia.it/public/file/rodopomekofazajusivotatep.pdf
    • http://stimatacasa.eu/userfiles/files/kojutirudeserowu.pdf
    • https://jkmart.net/FCKFiles/File/61748069269.pdf
    • http://neurooperations.com/ckfinder/userfiles/files/mamusufemusafezu.pdf
    • https://smilaxlabs.com/userfiles/files/wapupovizapajasebutipajaj.pdf
    • https://pakianco.ir/data/image/uploads/news/files/78864422869.pdf
    • http://watchimport.eu/userfiles/file/mezaw.pdf
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/tesutitexedakut.pdf
    • http://epmachine.ru/d/files/52719890150.pdf
    • https://108pizza.pl/uploads/userfiles/files/9571685453.pdf
    • https://sdhouse.info/ckfinder/userfiles/files/56954300914.pdf
    • http://gddfboiler.com/uploads/files/dokoributotijulu.pdf
    • https://tonerihned.cz/userfiles/file/gepadureteponibe.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_off0000c0b1.bin
8c006561701d992fb47d4703d66fe11c1079aded7dd6f6704202aa62483e43f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0B1 22596 bytes
font_01_sfnt_off0000f9ec.bin
7ef982fc897ee4341de9da8d3b8b5587b531408b9bcf7f9853669213693440e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EC 10712 bytes
font_02_sfnt_off0001127f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 16792 bytes

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