Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ad604bdf7f6454…

MALICIOUS

PDF

83.5 KB Created: 2021-09-09 18:53:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4ebf0d03d5a19cefa3f5dc113196dc29 SHA-1: 347a1240e4357bfcb549ba38f35345c0b2af7119 SHA-256: a8ad604bdf7f6454fd2a690909e1fc8c3dacadd3386018086a5fd402f0e6bdab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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, many of which point to potentially malicious or unknown domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.tobywells.org/media/fckdir/file/doxizivazub.pdf In PDF document text
    • http://kesherisrael.com/uploadEditor/files/83847796106.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/wofidimob.pdfIn PDF document text
    • http://www.everhouse.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16136b66cdef47---wivudiniwimonak.pdfIn PDF document text
    • http://thietbiantoanttk.com/uploads/files/gikukexosix.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/19935599354.pdfIn PDF document text
    • https://baongochoa.com/upload/file/fufemaxipupedaf.pdfIn PDF document text
    • http://carbonelite.ru/file/kafoxixuruzaxuwapivadoz.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/rufukumuwujaba.pdfIn PDF document text
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/gegefikipisoj.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/71833680550.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/konulubu.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/nefab.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/divexonanuxirud.pdfIn PDF document text
    • http://stainless-faucet.com/uploads/htmlupload/files/52290596478.pdfIn PDF document text
    • http://alrabbanoilandgas.com/file/files/69562288908.pdfIn PDF document text
    • https://irantruck.ir/data/file/412685675.pdfIn PDF document text
    • https://partetesal.ir/data/file/juriki.pdfIn PDF document text
    • https://euchebnici.com/img/file/delijowezefopukatexe.pdfIn PDF document text
    • http://abnicum.ru/files/file/99510213919.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/pipepalobubemawekufuw.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/58930257222.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/suzegadefaxodarep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+app+to+watch+live+premier+league+freePDF 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_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 17472 bytes
SHA-256: 65ccf04a8826fb69fd42f8eecfceccc5acd4e7e344cdcc5533531dae94ca4e06
font_01_sfnt_off00010dc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC0 11128 bytes
SHA-256: cd06a3f0c8f4a5c7cd6ee2bf67b9b40183f0afa245c7b31e90684f252e55db19
font_02_sfnt_off000127e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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