Malicious PDF — malware analysis report

Static analysis result for SHA-256 2639d270df309089…

MALICIOUS

PDF

72.3 KB Created: 2021-09-25 13:47:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d83374b36a07d23e32271f4dc4c53ea9 SHA-1: c18c92a5d411fec0e4c83b4e0195c88528739025 SHA-256: 2639d270df309089447a0cf359890c3765a2b10fd22a64b2491669da78465110
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to direct users to malicious websites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attack pattern involving user redirection.

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://crysiq.ru/uplcv?utm_term=episode+20+boruto
    • http://dreamsurgerycn.com/ckupload/files/32988770693.pdf
    • http://kozelsk-adm.ru/files/uploads/files/7499061881.pdf
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/jejov.pdf
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0v41fal146t9taafjsf4gbhu2v/32640886753.pdf
    • http://tydafa.com/dafa/uploadfiles/20210907174455.pdf
    • https://endeligmandag.no/e-brev/data/div/64450501370.pdf
    • https://mwasafat.com/uploads/files/38989808615.pdf
    • https://efckrakow.pl/userfiles/file/79423931153.pdf
    • http://fertilizerproductionprocess.com/d/files/lolibiperawanig.pdf
    • http://daimarconstrucciones.com/images/admin/file/96216324164.pdf
    • https://pharmnet.cz/ckfiles/files/files/75979701991.pdf
    • http://aqua4you.hu/userfiles/file/sixapatapa.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210922_CBB0330D6B65075F.pdf
    • http://thekreativecompany.com/uploaded_files/userfiles/files/40810035723.pdf
    • https://villatoscana-pi.it/userfiles/file/76789300487.pdf
    • http://choinka4x4.org/cms/files/file/pixezaduki.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/f3993e37682436e3b6e3a6a6dee5977b/85493528805.pdf
    • http://sdhmladavozice.cz/userfiles/file/rurujok.pdf
    • https://edubox.mn/uploads/users/0/files/31389324699.pdf
    • http://agrobud.net/uploaded/file/lusobajilubijotexu.pdf
    • http://fanghsin.com/uploads/files/202109141020299970.pdf
    • http://www.anclupnapoli.it/userfiles/file/50815381329.pdf
    • https://bd-sokolovska.eu/userfiles/file/bogekufufom.pdf
    • http://indagosrl.it/userfiles/files/64426121486.pdf
    • http://getampedmag.com/ckfinder/userfiles/files/wisalonogufazagutep.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_off0000b4ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
font_01_sfnt_off0000cd16.bin
63db0adb891952de63aaeee90add08b9829f208a8369e9d5842abd8377d92664		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 10536 bytes
font_02_sfnt_off0000e501.bin
417dfe68b588af575537fa855d988a6bf9c2957f200fabd23861e4ba7e9d5113		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE501 18212 bytes

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