Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12585ba7aa48435…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 02:48:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c9c2b98839354530395176214c2a428 SHA-1: f38744f7e829fdef636000633936a80d9887cd2d SHA-256: b12585ba7aa4843526e6945cd7e8f4e20e067ffb919a903e571d577d72ddb83f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious purpose. No scripts were extracted, but the presence of many external URIs suggests the primary attack pattern is directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://wastran.ru/uplcv?utm_term=720p+hd+mobile+movie+download
    • https://needletherapy.eu/upload/file/dadokabotipadafejena.pdf
    • https://croatia-flyfishing.com/files/1325823170.pdf
    • https://promoform.coreform.it/uploads/file/46019645752.pdf
    • https://ksdc.in/userfiles/file/69024376493.pdf
    • http://specialcats.nl/media/files/lutuwuwuxovaduwij.pdf
    • https://tjp2-hotlink-j3t.com/contents/files/89934870928.pdf
    • http://arredamenticucinesiciliane.it/userfiles/files/somamokegezonoxajokedigi.pdf
    • https://jobtiara.com/files/files/kudawoxuzubewefim.pdf
    • http://cistenivytahu.cz/upload/file/39607204938.pdf
    • http://csc025.com/userfiles/file/20210923062047_rmmsa2.pdf
    • http://tpt.taipei/asset/uploads/files/63148787287.pdf
    • http://thrifthelp.com/flash/thrifthelp.com/file/luxidir.pdf
    • https://kmkmekanik.com/upload/ckfinder/files/luparopogugarufalusefipe.pdf
    • https://clickbox.ro/images/file/xewagejexividojos.pdf
    • http://novafish.it/userfiles/files/99506500257.pdf
    • http://gnatowski.pl/attachments/file/94079898086.pdf
    • http://hyeminshop.com/DATA/files/kuduxuvuf.pdf
    • https://posaonakosovu.com/ckfinder/userfiles/files/lofatelataxofagomivonase.pdf
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/gikubamivumorasaso.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/5fcbf746e522e99a85bb1f2d7ad4f4d6/mejuvarusum.pdf
    • https://tavio.ru/files/file/5099091593.pdf
    • https://tarzminder.com/resimler/files/vogowidosekotopuzigox.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5670d71fc---gobazamawanotomaxexojoxif.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_off0000b273.bin
43c8ad84c654ee11aa53231da67a0fcae0b641d9512fff8a8b15385bccd49111		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB273 16980 bytes
font_01_sfnt_off0000dd38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD38 16792 bytes
font_02_sfnt_off0000f54f.bin
8c31ddaa83f0c1907831677f4e9e3ef8b1241fbd319af269233c27a29765e979		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10780 bytes

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