Malicious PDF — malware analysis report

Static analysis result for SHA-256 98a5036883cdd364…

MALICIOUS

PDF

77.6 KB Created: 2021-09-21 12:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 89fa1e7e00d31adf323ea89a427e87a3 SHA-1: c309e10b3cd0e0f6d040f2a3c6c16cf24648798f SHA-256: 98a5036883cdd364feb59883cd15f065ac157789cb50f20b18b3a68eb45ea752
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery document. The embedded JavaScript is likely used to obfuscate the malicious link or perform further actions, while the external URIs point to disposable hosting, a common tactic for phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=android+tablet+wifi+connection+failure
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/solelud.pdf
    • https://rockyhotelsgroup.com/uploaded/files/38890988307.pdf
    • https://www.pu-sk.com/app/templates/js/ckfinder/userfiles/files/xalofabevurop.pdf
    • http://truhlarstvi-strakonice.cz/files/file/wupugufipewawipiboboxane.pdf
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/92661580032.pdf
    • https://dijitalsanat.link/upload/files/solinukamaxulekefu.pdf
    • http://safaraval.com/basefile/safaravalcom/files/98595286080.pdf
    • http://prepearl.com/uploadsfile/figaxisotikudedow.pdf
    • http://sieuthihatgiong.vn/webroot/img/files/77850908662.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/lunizipatunagup.pdf
    • http://kiuanai.com/userfiles/file/7582031912.pdf
    • https://sim2007.com/files/73399023982.pdf
    • http://zlatartopalovic.rs/files/12713990069.pdf
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/98210584109.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ml5i3fkgatkouh63k4bcro2ub3/begiralefodepixireli.pdf
    • https://www.babetravelling.com/ckfinder/userfiles2/files/79460705313.pdf
    • http://bluebiz.kr/userData/board/file/89240189945.pdf
    • http://itena.si/uporabnik/file/zitonotiluvuvupijamakod.pdf
    • https://jooli.ru/ckfinder/userfiles/files/motumetitegufupev.pdf
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/ribozilawesirixupoxekiwo.pdf
    • http://bscsaoner.in/ckfinder/userfiles/files/vagozadiruretigowut.pdf
    • http://shoreluxurylimos.com/userfiles/files/pijixalopirawewajin.pdf
    • https://mmagame.com/userfiles/file/kosawatarunavivi.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_off0000cc80.bin
af4a7ad32a84fd7582baaa50f3dbcfdc4bcab9f232ee16765536a0c36986271d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC80 10608 bytes
font_01_sfnt_off0000e4f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F0 16792 bytes
font_02_sfnt_off0000fd02.bin
5b5273bdae54e60b84c9f8aa9b0ef965899879d159be79790200453111c17379		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD02 16876 bytes

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