Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8847a91bb95988b…

MALICIOUS

PDF

88.5 KB Created: 2021-09-21 03:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d317ca0b096868143cf3bc13fe20e356 SHA-1: 3c43b07e113886c89017ee4d31a49f7f2abea517 SHA-256: c8847a91bb95988bf10024a3eed95900b9fb0083d9da252d9da9a80a6f8e212e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs pointing to potentially malicious content, and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, a common phishing tactic. No scripts were extracted, but the overall structure and heuristics strongly suggest a phishing attempt.

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://dananeye.com/uploads/files/202109100737306636.pdf In PDF document text
    • http://zzzwchem.com/upload/files/48222861767.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/pofiwugababota.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/17307675847.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/41532151888.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/86543582438.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/93065063931.pdfIn PDF document text
    • https://galaxytraining.examinationonline.com/files/28087921175.pdfIn PDF document text
    • http://vhz.cz/user-files/tutoragusopezederu.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/vumonuw.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/161312c860eb65---gujufelakewunivimalif.pdfIn PDF document text
    • https://horgaszvelem.elelmiszer-hazhozszallitas.hu/ckfinder/userfiles/files/96392494518.pdfIn PDF document text
    • http://dycelife.com/userfiles/file/xovatufozodilipeb.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/87372075655.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/84824668672.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16312781347858.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144bf1ef40bd---83845259106.pdfIn PDF document text
    • http://nattukoottam.com/userfiles/file/32592952604.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/13567657907.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/romanil.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614814f964d99---29511945100.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/firofevezomezibupewazi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/niloluvudaj.pdfIn PDF document text
    • http://africareview.in/userfiles/file/80041412529.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/putixefawodipem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=music+solfege+hand+signsPDF 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_off0000f2a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A8 18932 bytes
SHA-256: 5538fca545c2f910cd3418bede5077624e2052dcce0c2c40f3226fc4adb788ec
font_01_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C49 10652 bytes
SHA-256: 6d0b4d159c3602afe8cec12a82e521a32761ebbf1a3dea9ac3aba0bc497ce51c