Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef46f47864c6d79…

MALICIOUS

PDF

82.1 KB Created: 2021-10-12 16:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 00fad40f0ac8c21d2eca14c9927c6712 SHA-1: 2896c22797518da82292d9b83f3fd8ce866dc663 SHA-256: 8ef46f47864c6d797168b4c3f201f0157528bc6a1d8dfe55f2824016250b2b6a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to a link farm hosted on various domains, many of which appear to be disposable. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely for phishing or distributing further malware. The ML classifier and ClamAV detection further corroborate the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://www.frontieregypt.com/sites/all/libraries/ckfinder/userfiles/files/66717131397.pdf In PDF document text
    • http://tuning-zone.eu/userfiles/file/xixorisilojova.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/visujemeletukuliliwe.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/92497657637.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/50486311549.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/27769705370.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/8494881127.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/94239492680.pdfIn PDF document text
    • https://jphotographyllc.com/userfiles/file/bosedevemofa.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615645cf2117e---18366296405.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/71647373496.pdfIn PDF document text
    • https://kaimano.it/file/dubude.pdfIn PDF document text
    • http://sinojjacob.com/userfiles/file/niluzodoxa.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/94943635322.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/28344102686.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/60034659149.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/zetubemirazurun.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/47131480941.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/lonis.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/26584061423.pdfIn PDF document text
    • http://flyingfish-stay.godyouoh.com/userfiles/file/139038295.pdfIn PDF document text
    • https://suacuasathcm.com/uploads/files/xepavexikejurerajel.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/5bhJmFgkeCE/uplcv?utm_term=now+discover+your+strengths+book+pdfPDF 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_off0000d97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD97F 18200 bytes
SHA-256: e8d1b391a30132c67d66a2c6794920fe34fea019969513deffd96ddacce89948
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C2 11268 bytes
SHA-256: e744d3deecb58eb96511c4ec60258eae1af16f22e2c0eb38d446a712eddd7216

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