Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ffda65acba0b7a6…

MALICIOUS

PDF

70.6 KB Created: 2021-09-12 22:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 698de16aa96d522e654e05880bbfff38 SHA-1: d5d616917cd5bbb0bb91b1df9b3af61bba33b366 SHA-256: 9ffda65acba0b7a6bfb0b4fec81f07ead4c66b4e75ba8122bb5eb93451b329e0
126 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to disposable hosting and are likely part of a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to disguise malicious links within a large number of seemingly unrelated URLs, suggesting an attempt to evade detection and lure victims.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/salepomareje.pdf In PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/8f3ddccf6c64e185a989dbe6737dad70/jarerigizilunegatodomomok.pdfIn PDF document text
    • http://apple888.vn/luutru/files/kibaziwugiwovosegus.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/61264852037.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/41726673577.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210909_9E16B7003AC7D579.pdfIn PDF document text
    • http://bociany.sk/media/file/moleb.pdfIn PDF document text
    • http://ckudzcssffhhj.handysociality.com/upload/files/9225825606.pdfIn PDF document text
    • http://xn--4k0b43gkwo4gn.com/upload/editor/file/93463753946.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/8614874342.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/xodotupumekubaruke.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/92779647468.pdfIn PDF document text
    • http://tysons-cafe.com/uploads/files/45869180770.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/39179962704.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/xejudar.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/51338706735.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210910143350.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/salafe.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/12450597533.pdfIn PDF document text
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30850504292.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/zogujubisa.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/2064054692.pdfIn PDF document text
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/xigil.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/fawenofol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=download+pokemon+platinum+gba+version+zipPDF 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_off0000b30a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB30A 11280 bytes
SHA-256: 8c666e7f7a50df1f7c90c8e497b1cb399ff61cf08ed2da983450463422bbe3db
font_01_sfnt_off0000cd23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD23 15256 bytes
SHA-256: bbc40ca08b9f62d7c8e6ffc08dbacf3f37c4740218909f78ee45437da1e736a8
font_02_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1