Malicious PDF — malware analysis report

Static analysis result for SHA-256 43243774dbebec3c…

MALICIOUS

PDF

87.1 KB Created: 2021-09-23 07:16:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1349839a70e63ff1573ea92bdeb49aa6 SHA-1: 2b0c2ad0112b2d066df32d3179ca8d4f11a1cb35 SHA-256: 43243774dbebec3c2efd774954d013dee3bbc99f870496f412be8dd5a5b4d5de
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of an advance-fee scam, as indicated by the 'SE_ADVANCE_FEE_SCAM_LURE' heuristic. It contains numerous external URIs and links to disposable hosting, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://pistant.ru/uplcv?utm_term=how+to+check+your+phone+usage+on+android
    • http://neuroxl.com/images/file/bexosiveme.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c00721a275---rusenoxulaf.pdf
    • http://www.euro-fly.eu/userfiles/files/wodoxaboxukenenekuzifu.pdf
    • https://peusch.lu/userfiles/files/zovalojudizujunivegutan.pdf
    • http://frutapacargentina.com/ckfinder/userfiles/files/nojiwu.pdf
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/fevopesizofuzedeg.pdf
    • https://vishalahospitality.com/ckfinder/userfiles/files/5292727878.pdf
    • http://francescofesta.it/userfiles/files/19890664187.pdf
    • http://cameradungphat.com/uploads/files/runiforitakikajujoz.pdf
    • http://tvsporedi.si/vsebina/71643722306.pdf
    • https://bushregenerators.com/userfiles/files/42715853635.pdf
    • http://alfonsoguiggiarchitetto.it/userfiles/files/15253014941.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131a27ba0f56---sexavulufazusupokokuj.pdf
    • http://www.w.radeton.cz/ckfinder/userfiles/files/48882816639.pdf
    • http://bioident.pl/photos_fck/file/46602387573.pdf
    • http://taixingchem.com/uploadfile/file/20210916032346577.pdf
    • https://lawweb.info/mycms/admin/userfiles/file/finiwavunu.pdf
    • https://barcelonamedicalcenter.com/files/galeria/files/pokapixijoseva.pdf
    • https://tucarrorentacar.co/ckfinder/userfiles/files/72804113736.pdf
    • http://dkstores.gr/userfiles/file/wifevepuvujasuli.pdf
    • http://ventima.ru/userfiles/file/sinisevodusulakotezagoji.pdf
    • http://rayhovietnam.vn/upload/files/galogepazikef.pdf
    • http://ud2-140.com/files/10376215556.pdf
    • https://cakkue.com/contents/files/virasogigajowoga.pdf
    • http://pm-ural.com/uploads/files/sikafir.pdf
    • http://thepokewave.com/uploads/files/dipuluzapewabonawumidop.pdf
    • https://kattliv.com/kattliv/admin/userfiles/file/dukudikox.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_off0000edd6.bin
7a9c702e533f8ba44c1f68e035962cd456c4123e022e2efda2f9de064e398801		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 11132 bytes
font_01_sfnt_off000107a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A8 16792 bytes
font_02_sfnt_off00011fba.bin
6f5a2ec74ec62452daa0ae1c0c9126a57d8605186549f53d6788b87bf16f8752		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FBA 17620 bytes

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