Malicious PDF — malware analysis report

Static analysis result for SHA-256 960cb2846bbe7945…

MALICIOUS

PDF

94.5 KB Created: 2021-09-08 21:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fe6a473c779094056617706ef8d6ec77 SHA-1: b3633ee7fa2b68200c22ea54881f44aaf5eaab2c SHA-256: 960cb2846bbe7945feedbcc4692733423b6cfc18300623505653ba778ec4bb12
174 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple external URIs, flagged by ML classifiers and ClamAV as malicious. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic indicates the document instructs users to copy and paste content into a shell, a common technique for executing downloaded payloads. The presence of JavaScript suggests it may be used to facilitate this execution or download further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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 http://aristosaigonhotel.com/uploads/files/37697943343.pdf
    • http://chekeeh.ir/basefile/chekeehir/files/ruteludijitoxefegep.pdf
    • http://music-saikung.com/ckfinder/userfiles/files/72646215476.pdf
    • http://saltokisport.com/uploads/files/datudupi.pdf
    • http://lideparts.com/userfiles/file/1630666936.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/nozowakosumoxanizef.pdf
    • http://studiosimonepantaleo.it/userfiles/files/53860587116.pdf
    • http://tornyanggrace.com/upload/file/zubovojiseza.pdf
    • https://chachachat.info/js/ckfinder/userfiles/files/8845246458.pdf
    • http://waetsukai.jp/system/ckfinder/userfiles/files/vafiras.pdf
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/dubogadetifiw.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613285793dcde---tevul.pdf
    • http://eyupsifalibitkiler.com/resimler/files/xuwozewotijiveluvuz.pdf
    • http://pp-aqua.com/userfiles/files/52184706425.pdf
    • http://innotec-industrie.be/userfiles/file/porefekefepe.pdf
    • http://fatimaartwork.com/userfiles/file/43408599802.pdf
    • https://efficimm.fr/userfiles/files/25187804785.pdf
    • http://guidesdugrandlarge.fr/images/import/file/gusukododasevizoru.pdf
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/29251904640.pdf
    • http://mobil-tech.com/files/votadosuwerigonetenumad.pdf
    • https://www.willmarshelter.com/ckfinder/userfiles/files/duwavunijamodanujiruguw.pdf
    • http://innotack.com/userfiles/file/xodozagex.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161381d2770802---fabatuluramikarevijovobit.pdf
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/vugomovovoxozapovojoni.pdf
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_085F5D29331FE542.pdf
    • https://ra7a7p-h3ba7.com/contents/files/66951768871.pdf
    • http://mojahotels.com/ckfinder/userfiles/files/xipejujagisemuzu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=edit+pdf+linux
    • 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_off00011048.bin
9124dd56e9fb0629cbe3e58faf07e081e599a9e40cf0afebf9daf0197eed2e7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11048 9996 bytes
font_01_sfnt_off00012672.bin
fb6ecdf126b3684911ddea2ec1d2cc0bb3628537aa266689a9147ef7d18bad1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12672 18228 bytes
font_02_sfnt_off000154b2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x154B2 16792 bytes

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