Malicious PDF — malware analysis report

Static analysis result for SHA-256 660f2d6552274627…

MALICIOUS

PDF

82.6 KB Created: 2021-09-19 15:16:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0f3dc03b2aff8dd1f102e66de9b1400a SHA-1: a3101e6f4c996d44f9c529db6102064c3f6c3bb1 SHA-256: 660f2d6552274627089b1271aec8739a863cb923ec7a808423ea3cee2964de64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting an attempt to distribute or redirect to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://abakus-routing.co.uk/ckfinder/userfiles/files/89747928088.pdf In PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/narete.pdfIn PDF document text
    • http://yuhao-tech.com/userfiles/file/dojuzukiwaxeb.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/32077571094.pdfIn PDF document text
    • http://bhhangkhong.com/upload/images/files/79237076182.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/juzanidironuno.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/97997458980.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/xowokejitir.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021090916362549.pdfIn PDF document text
    • http://sin-hua.org/userfiles/lobinap.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/78688339650.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/4947602262.pdfIn PDF document text
    • https://sklepbonus.eu/userfiles/file/4838037683.pdfIn PDF document text
    • http://hp-cnc.de/uploads/files/duxakileguwowegefin.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/24304966203.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/kefuxesubekozogifuwoboten.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/161427120c38f6---97224708328.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/bujonalabami.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-11/20210911005150332319.pdfIn PDF document text
    • http://esistore.be/userfiles/file/68586507895.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=justice+league+full+movie+download+mp4PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 11184 bytes
SHA-256: 6dbb50d9fb1bc7c1e3bdfd6fc8f60d1c86ccad3b683f7d44f97dc4cbdd492427
font_02_sfnt_off00010cf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF9 18396 bytes
SHA-256: ded7a8a68b1ae573d63932b4f094af623095dc254b777f9ae2fdc59eb6d31a04

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