Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee63b967992a6c98…

MALICIOUS

PDF

83.9 KB Created: 2021-09-20 17:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdee93772b30f706f9ef76bdbff6bc18 SHA-1: 0b16af4ecb437a904a0479b69b726dba02ae45e5 SHA-256: ee63b967992a6c98adb4f4cbdcb329428eed81860c872d600c36e3dc7bfafaf2
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, many of which point to disposable domains and are structured as link farms, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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

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