Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aac9de8c781977…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 15:32:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4ba038cfe513140ec2cd30022ab6d2f9 SHA-1: 0d684ced3e478a86f87a0d9f2df5592a094c0c71 SHA-256: a5aac9de8c781977c856191a87a5bd594fe42922f96e5db375120217a8b688c4
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many of which are hosted on disposable domains. This suggests an attempt to obscure the ultimate destination and potentially deliver unwanted software or lead to further phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/d953af6620023059af03e44142dcbfe6/57054343963.pdf In PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/48807424620.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/17007fea8e088e9db094618ad72b90dd/98640980330.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/jugoleponowolilo.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/18564547976146cf40cde11.pdfIn PDF document text
    • https://sportuna.be/ckfinder/userfiles/files/76759751282.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/kisalupoxowuxus.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/65198681416.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/58620490429.pdfIn PDF document text
    • https://onlinendttraining.net/files/fitapipevijiwegerid.pdfIn PDF document text
    • https://wojczak.pl/userfiles/file/42092468856.pdfIn PDF document text
    • http://gmart-express.com/demo/uploadpic/file/finavegitanobamuvav.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/bupuvubabuxexabiredut.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/wisujodafomuvuvuxosi.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/17249162360.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/juponobozose.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/27400955983.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/bupugigovijopiza.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/kawerujibel.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/73456163113.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/99355563917.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/sedafidiwokelojulijurojig.pdfIn PDF document text
    • https://datajournonepal.org/files/28869861658.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/21441660154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=download+convert+to+mp3+apkPDF 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_off0000d2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB08 18100 bytes
SHA-256: 635350086d69738239a75289a0c02299aae037efb2f92f8e34347c9bb7a7c3fd
font_02_sfnt_off000119c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 10832 bytes
SHA-256: a7bc39d06c083d288a5cf4c065465e7cac78d37503bab29072e3aacc7179555e