Malicious PDF — malware analysis report

Static analysis result for SHA-256 96d5e45075f63254…

MALICIOUS

PDF

79.9 KB Created: 2021-09-17 11:58:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 752615945a452c2d439ef225943f3b15 SHA-1: 40ed9b46b6546b5ea46bf3005da2a94cfa00db12 SHA-256: 96d5e45075f632542c4f832ced5f584c39d4d0061a6cc118b087dd6a25b5cb64
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a strong intent to redirect users to potentially harmful content. The presence of external URIs and the overall structure suggest an attempt to lure victims through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://nomylo.ru/uplcv?utm_term=rude+words+that+start+with+g
    • http://atreve.eu/ubezpiecz/obrazy/file/13250155103.pdf
    • http://hujiangsy.com/upload/files/fawalab.pdf
    • https://www.eos.org.eg/ckfinder/userfiles/files/pawatevutumorekelol.pdf
    • http://bugaboo-buffalo.eu/UserFiles/File/dakazosupabawezusazot.pdf
    • http://medical-1669.com/userfiles/files/vuvojagupegabapirot.pdf
    • https://standsimulator.com/ckfinder/userfiles/files/41073239435.pdf
    • http://www.thaiboat.net/image/upload/File/gonojemirisedu.pdf
    • http://gamax-moto.cz/data/dokumenty/60416474642.pdf
    • https://icon-studios.com/userfiles/file/xagijaluwisowokimukenezej.pdf
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/56860178837.pdf
    • http://matchonusa.com/uploads/files/pefugetibadefi.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/94662630019.pdf
    • https://almuhja.ps/ckfinder/userfiles/files/dafanurivagukuwafa.pdf
    • https://podimercrm.com/img/files/kanunegoniwim.pdf
    • http://skyrybupaslaugos.lt/uploads/files/29805869400.pdf
    • https://agrilaui.com/userfiles/file/tidimisode.pdf
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/gezewoge.pdf
    • http://gildiamasterov.ru/userfiles/file/11719916587.pdf
    • https://gegeny.hu/uploads/file/84836428587.pdf
    • http://dhalahoredeals.com/survey/userfiles/files/motezag.pdf
    • http://abwcrainhwy.com/uploads/files/girefasixom.pdf
    • http://dorrstrechy.cz/UserFiles/File/bazovivururifapijipedofaw.pdf
    • http://lecieldesandes.fr/ckfinder/userfiles/files/nixufarewu.pdf
    • https://transmilenio.net/datamont/userfiles/file/rakolukazukawazeme.pdf
    • http://birizgardenhotel.com/userfiles/file/22270344206.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_off0000cf11.bin
d129f4f0d3f2f2f754914147036f787c135b2d67ae48dc2d9f6716d7ee2464ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF11 10608 bytes
font_01_sfnt_off0000e757.bin
605f6dcb06143c4c369969feecfde201137a41e9ed53ab6b2351546f956cd8dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE757 19116 bytes
font_02_sfnt_off0001195e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 16792 bytes

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