Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b971268fce5d5fa…

MALICIOUS

PDF

77.4 KB Created: 2021-10-09 04:02:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 01920167e5d6ca4bcc40bf2b055296ab SHA-1: 7221fff3e0c6a2fbbaec90a5bf63f6c50dcdb9a1 SHA-256: 4b971268fce5d5fa50749b2dafaf63bc301a8f586d9a9176dfd25faa945d5af8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://cructi.ru/uplcv?utm_term=discoloration+on+legs+and+feet PDF link annotation
    • https://www.wizzfizz.com.au/application/third_party/ckfinder/userfiles/files/tabosorogajelumapesariwe.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161600645c20f5---mezulunoparak.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/kedusojuvu.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/zinoj.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/81934953375.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/31821587107.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/83551785887.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/feropotenakomulusadatotu.pdfIn PDF document text
    • http://aristosaigonhotel.vn/uploads/files/34681284468.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/98817072728.pdfIn PDF document text
    • http://ariege.proximeo.com/ckfinder/userfiles/files/16486998268.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/18378675562.pdfIn PDF document text
    • https://stabiactiv.com/userfiles/file/fonefijotefuzovowijod.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/78298007075.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/vitedefusowekufeletaluro.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/pujafimunovo.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/datuzobusuj.pdfIn PDF document text
    • http://korio-olsztyn.pl/userfiles/file/wasidobofinak.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/jibiwotitis.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/66752419846.pdfIn PDF document text
    • http://richardchong.com/userfiles/files/33059515043.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/vetofolidivewut.pdfIn PDF document text
    • http://dj-venci.com/uploads/pages/files/71781969618.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/21385515272.pdfIn PDF document text
    • 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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 17180 bytes
SHA-256: 0406ca31eb9354f53111378c28f0b282588745b6ad2bb041ffed61586765f7f5
font_01_sfnt_off0000f772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF772 10652 bytes
SHA-256: 60ddc56d48a70189923808dda5a2ec411fe6169a46e254e43c274c671371a0fe
font_02_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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