Malicious PDF — malware analysis report

Static analysis result for SHA-256 57e84fc3a804ba53…

MALICIOUS

PDF

77.9 KB Created: 2021-09-14 21:00:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 340ade2616410f13c650a16e8db87389 SHA-1: 292e1f5b76c5bce5811e4608187b1e0fa040556b SHA-256: 57e84fc3a804ba53042d207f1924a5f5030574c2ed1998075d56bf302856bfd3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to potentially disposable domains, a common tactic for distributing malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect the user to malicious sites, likely for further exploitation.

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 http://multi-accueil.fr/ressource/site-image/files/parobijomanurinuxuwi.pdf
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/33380876504.pdf
    • https://abhrian.com/userfiles/files/xokejige.pdf
    • http://koryosushi.com/uploads/files/kaduguledosupokuvidepon.pdf
    • http://savitaco.com/uploads/images/files/pagunibepegavigegu.pdf
    • https://giritrademark.com/content_files/files/96649167288.pdf
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/rilotuvasufezuretuxubes.pdf
    • http://geo-equipe.it/userfiles/files/29095350732.pdf
    • http://mercuresamuichaweng.com/admin/file/nosipura.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/niwidopowibevi.pdf
    • http://www.klccpa.com/userfiles/file/
    • http://yuanda-boiler.com/d/files/21831265665.pdf
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161331287714db---falasuveleweki.pdf
    • http://kahasat.cz/data/file/81922377699.pdf
    • http://master-br.ru/img/file/25346269108.pdf
    • https://tspinstruments.com/cache/fck_files/file/86159116339.pdf
    • http://romento.com/uploaded_files/userfiles/files/29736785097.pdf
    • http://urgentcarepb.net/userfiles/file/gumimepubov.pdf
    • http://macierz-grodziec.org/files/file/32395517278.pdf
    • https://bahia-group.com/ckfinder/userfiles/files/bofaxiwivarusen.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16139387961d98---24591246571.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/jobowotop.pdf
    • https://mlspoland.co/files/file/58763097528.pdf
    • http://miyozenemeryville.com/uploads/files/24434874964.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=short+life+2+unblocked
    • 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_off0000cc21.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC21 16792 bytes
font_01_sfnt_off0000e438.bin
99b839cbfe62142dbb2a9e8f02ae91f5a4b6fb6286fc59c21fda2e8fec92b609		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE438 10772 bytes
font_02_sfnt_off0000fcf3.bin
fb1baed687b3febdbb49da9044d3be0261a3afef5de1ffbc22af00783362187e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 17428 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.