Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dbf9f12e515af04…

MALICIOUS

PDF

72.0 KB Created: 2021-09-10 23:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ff723dee1ac4986a68d87e76985d4eb7 SHA-1: 52a4acde58248370a54fbf70a35c21c8ccd26354 SHA-256: 7dbf9f12e515af040d0c2d7d5931c4064bd0b7c8a3ab9e8918e2be2e96a4fe61
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high number of distinct hosts suggest a malicious intent to redirect users. The ML classifier and ClamAV detection further support the malicious nature of this file, indicating it is likely a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://tongshengchem.com/ckfinder/userfiles/files/92834856847.pdf
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613adce661caa---40919593832.pdf
    • https://tl-systems.hu/files/files/57816900357.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/92455320523.pdf
    • http://premiumcsp.com/uploads/files/69688669235.pdf
    • https://justforjetscatering.com/userfiles/image/files/89320980712.pdf
    • http://tsradviseurs.nl/mailing/images/photo/file/96302044899.pdf
    • http://rund.cz/UserFiles/File/nikalofepugesakasesuguxeg.pdf
    • https://locoffice.ru/userfiles/file/31142665119.pdf
    • https://limblength-sldf.com/userfiles/file/58844443374.pdf
    • https://quangcaowebsite.vn/uploads/files/69008600074.pdf
    • https://ooo-kenk.ru/userfiles/file/lopemuvo.pdf
    • http://honghuibio.com/d/files/kuwapanemewufibab.pdf
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/vuten.pdf
    • https://cryptobasics.biz/uploads/files/sepanafisiwunonakebode.pdf
    • https://topclassgreenery.nl/images/file/97483621210.pdf
    • http://jgbt.us/pds/userfiles/files/83404663298.pdf
    • https://lazeo.nl/userfiles/file/binezobiruxiralalomoki.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/11297682437.pdf
    • https://aksusu.com/upload/files/7046116654.pdf
    • http://fitviewer.com/files/file/84535523683.pdf
    • http://nelly-design.ru/upload/files/39582797312.pdf
    • http://brno-skoleni.cz/ckfinder/userfiles/files/44273320158.pdf
    • https://asken.as/bilder/file/foxawudozipegil.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=demon+slayer+movie+movie+online
    • 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_off0000b5ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5AD 16792 bytes
font_01_sfnt_off0000cdc4.bin
8f20ad041ffd3e4f413b997798aa7c60b6a53cd4f003a7908bd844510edadf3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC4 10352 bytes
font_02_sfnt_off0000e51b.bin
1046cf87f9097c1bfd4fc91170b1c30f052f4024cf810790889c477cb142c9a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE51B 17444 bytes

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