Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa687b80865f4c2b…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 16:55:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c2c9b7589971e32d10ca1738a37ad219 SHA-1: d25d73fcb196dc1ab512dbdc2c31878c09ca4c26 SHA-256: aa687b80865f4c2b3f97e7d0aaeed61f141c6cbd39f83255ff5cf0943b1d101b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure and heuristics point towards a malicious PDF designed to redirect users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://timnhanhonline.net/upload/files/maxuzaf.pdf
    • https://juniorclublivorno.com/sitonews/images_upload/files/jakamexi.pdf
    • http://inspiredindianfoundation.org/uploads/luzazuvim.pdf
    • https://pabxlg.com/userfiles/file/takivewobokimafuxepepex.pdf
    • http://ultraljud.nu/bild/files/22847756354.pdf
    • http://hitelesen.com/userfiles/file/55703029634.pdf
    • http://avtrak.ru/ckfinder/userfiles/files/31324923579.pdf
    • https://robodom.si/files_vsebine/kifaroduriwuve.pdf
    • https://magerp.org/upload/files/2052547181.pdf
    • http://abwbaltimore.com/uploads/files/bisif.pdf
    • https://bistakalikotenetwork.com/userfiles/file/556190938.pdf
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/17014849995.pdf
    • http://buffagiuseppeinfissi.com/userfiles/files/wenabefesumovuwutafawelo.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ipj28b1ebipdvq4m0o5ilp5io/70551842782.pdf
    • https://artasedanasingaraja.com/uploadfck/file/13757803919.pdf
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/82583442426.pdf
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/13864519475.pdf
    • https://serpavenger.com/ckfinder/userfiles/files/rozepixafadogejufebalolej.pdf
    • http://esistore.be/userfiles/file/68257400004.pdf
    • https://specializedfacilitymgt.com/public_html/userfiles/file/36619680814.pdf
    • http://dotbamboo.com/file_media/file_image/file/32640763768.pdf
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/pg690ut0b93hm4usp1r84e57m5/liguwirexovoribe.pdf
    • https://ismet.com.br/ckfinder/userfiles/files/53158623465.pdf
    • http://kooijobs.in/ckfinder/userfiles/files/wurosulukukadonixelureki.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=antonyms+and+synonyms+word+list+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_off0000eea3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEA3 16792 bytes
font_01_sfnt_off000106ba.bin
149920f15572bb29abc73f5874bb83e0d6da717dcabc9758b94b66e60865fe25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 10708 bytes
font_02_sfnt_off00011f5d.bin
419b66517d2bcad439733e8134430dfc25af8ea317af82dd14369d54cf5bf31c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5D 19244 bytes

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