Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f979fe1ff068b15…

MALICIOUS

PDF

85.8 KB Created: 2021-09-12 20:45:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a9bb23afb3c739d2f620e0eaffbd1a83 SHA-1: 26ee45ed2769b5dd10fc008b7af7e29390e16ecb SHA-256: 7f979fe1ff068b15d7be572ced5ceebc14efed0b73b8e5e08331f89da498835e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the URLs as a link farm on disposable hosting, likely to obscure the ultimate destination or to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://pistant.ru/uplcv?utm_term=watch+demon+slayer+movie+english+dub PDF link annotation
    • http://baodieptailor.com/uploads/2021-09-09/images/files/jopavogovelejaj.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/25017451394.pdfIn PDF document text
    • https://digireg.com/upload/78283391366.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/vowopasome.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/1216470964.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/61297921251.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/87892459485.pdfIn PDF document text
    • http://nincity.de/inline/file/54776739386.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137d9ce9f533---bowetibuvifu.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vejedopo.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/pupokafi.pdfIn PDF document text
    • https://nocenzura.space/web/img/podborky/files/jopemarik.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/file/1630777680_1.pdfIn PDF document text
    • http://sibstroiexp.ru/userfiles/file/94899898361.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/30162861424.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/tizawuvufi.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e1fe93ffe45dff1bebd9524302524a4d/rerumaso.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/filelibejotibo.pdfIn PDF document text
    • http://mofrantech.com/userfiles/file/54976151504.pdfIn PDF document text
    • http://canvangdientu.com/images/file/67548623773.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/74419805010.pdfIn PDF document text
    • https://kingcarmotorista.net/uploads/files/zolurapakazonemitu.pdfIn PDF document text
    • 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_off0000e886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE886 17844 bytes
SHA-256: cb07632f8171100e6bf013a565ac42cd0306a868d551011eef87a504504e9c1d
font_01_sfnt_off00011760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F77 11228 bytes
SHA-256: 023666e6beb529f838228e87254717c0faf7bf7cf52e491b0d42e617d858da20

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