Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8774693525fa5e…

MALICIOUS

PDF

84.1 KB Created: 2021-09-20 17:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0573c54fe0ac66330fc25b9fc896a81c SHA-1: 964dda5b88f72bb561a2786b74bc8b1c0dc62dea SHA-256: 4f8774693525fa5e030d7746e245f4372bc7a7bcf8492c843fdbe056c5f6050e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to external websites, many of which are structured as link farms on disposable hosting. The presence of these links suggests an intent to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://pixomot.ru/uplcv?utm_term=how+to+turn+off+pop+up+notifications+on+android
    • http://parejalecaros.com/adjunto/upload/fck/files/zodiz.pdf
    • http://fotografiafrancescosomma.com/userfiles/files/55809469760.pdf
    • https://ostrichtours.com/ckfinder/userfiles/files/35054347251.pdf
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/58051729022.pdf
    • http://neoneophytou.com/ckfinder/userfiles/files/powipigesonabukiwobo.pdf
    • https://hizlipin.com/calisma2/files/uploads/bupixax.pdf
    • http://dayuntang.com/assets/uploads/ckedit/files/20210907021214.pdf
    • http://hoanhaochemical.com/uploads/files/18311506188.pdf
    • http://andersonlawdecorah.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zejamejutu.pdf
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/fifijepaba.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb5345761a---23332377363.pdf
    • http://tainanrup.longi.tw/uploadfiles/files/20210918_092640_7940.pdf
    • http://austral-immo.com/userfiles/files/vexabikuzek.pdf
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/fipezavinifaton.pdf
    • http://rehahomecare.com/upload/editor/files/jokuxuki.pdf
    • http://dinhvi5s.com/images/newtech/files/25683175460.pdf
    • http://indagosrl.it/userfiles/files/47939079554.pdf
    • https://digireg.lu/upload/jojamafutaxarudobidabuvap.pdf
    • https://horgaszvelem.hu/ckfinder/userfiles/files/zifedosogajavabigafu.pdf
    • http://coaching-scolaire.net/userfiles/file/xoxaxosi.pdf
    • http://beerskiboot.de/img/upload/file/vuremu.pdf
    • http://elektro-galerie-hamburg.de/userfiles/file/59540103089.pdf
    • http://think6.net/ckfinder/userfiles/files/20210914171043.pdf
    • http://www.leposeur.fr/site/upload/ckfinder/files/74268973983.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_off0000e17d.bin
bac7da8e9f33540b81fea3e2dbf9148140c0f7eb9578763d3345c1d033fde08f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE17D 10612 bytes
font_01_sfnt_off0000f9e6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E6 16792 bytes
font_02_sfnt_off000111f8.bin
c0f79c2d3d255f6680626cfccb59381aa70eb3f0c2e283fc6ed0ab1af08dc27f
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F8 18816 bytes