Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd645249274f2907…

MALICIOUS

PDF

67.0 KB Created: 2021-09-16 15:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 39aab5ebaeb841fbf86e0a3199dbaa07 SHA-1: ea4f20d133a4bb1ada16f893c639ff6b67bf66c4 SHA-256: dd645249274f29071e402ad39eb7819351d963eaacd1a698e94bb55e3a4399b5
94 Risk Score

Malware Insights

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

The file was detected by ClamAV as a phishing trojan. Static analysis revealed it contains numerous embedded URLs, with many pointing to disposable hosting, indicative of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior. The primary purpose appears to be redirecting users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2894

Heuristics 4

  • 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
  • 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://fazekaskozpont.hu/images/upload/file/pejurotaxizazux.pdf In PDF document text
    • http://gallery4walls.com/upload/editer/file/31196033245.pdfIn PDF document text
    • https://parc-hotel.info/file/wewevikubisasudodoso.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f81dd3f8b---79841546504.pdfIn PDF document text
    • https://edgecs.com/documents/vinanixarebogajila.pdfIn PDF document text
    • http://spiregene.com/image/files/20210915_223402.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/sakajusugirugovox.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140ea85cfb20---kosobe.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/gesijarejuxipaxipidejilim.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/68650046555.pdfIn PDF document text
    • http://khocabien.com/uploads/files/91067676787.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/61188788893.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/36847716217.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kudugijixekarufuxeza.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///81841747571.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/muzepo.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/guxonetaxurusokemadani.pdfIn PDF document text
    • https://kompaspt1.com/contents/files/rivesuvesokoma.pdfIn PDF document text
    • http://air-ned.com/uploads/files/xupewamuzafinejikada.pdfIn PDF document text
    • https://mavibusiness.it/file/tasalinixudanijivil.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/dixaz.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/xoxib.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/4110555678.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/98055200203.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/23492728275.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/10258491733.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631505339.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/83285755845.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=calculator+app+hide+appPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA36 15888 bytes
SHA-256: d46da32c844b27ba1f5860dc0e9e29ed7ee24099e80188eb372ba90068b299d5
font_01_sfnt_off0000e349.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE349 10468 bytes
SHA-256: 67961ae2a48749b0169d658526452838f917a91e08624262d96fda3663d3667d

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