Malicious PDF — malware analysis report

Static analysis result for SHA-256 54dcfbc31d5ed971…

MALICIOUS

PDF

71.4 KB Created: 2021-09-16 14:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4b98d6b329a2f83b40a41f008abf862d SHA-1: a4d1449783c02cd17b58777315eed78093b3a6cf SHA-256: 54dcfbc31d5ed97184037d6e90a8f8e4c1eb6a9ff75a313927755a5047344268
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malware. The presence of embedded JavaScript suggests an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rungrawin-itt.com/userfiles/files/78130547728.pdf
    • http://gildiamasterov.ru/userfiles/file/jojuwibedipimadekutaboku.pdf
    • http://rencontres-icare.org/userfiles/file/62691905082.pdf
    • https://profm.hu/files/file/43204505526.pdf
    • http://mega.kz/media/upload/files/40312507899.pdf
    • https://www.sterlingsez.com/ckfinder/userfiles/files/32451109732.pdf
    • http://digilit.ir/basefile/digilitir/files/karetexotanamulewu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614028e890ca6---gosokalilaxebora.pdf
    • https://tatsolarlight.com/uploads/files/tusipejusif.pdf
    • http://nataliashishkina.com/userfiles/file/befexiwuzi.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16132c524d07d4---2931042343.pdf
    • http://tcihk.com/userfiles/76021048430.pdf
    • http://www.sun-green.eu/ckfinder/userfiles/files/3235430686.pdf
    • https://balarampurblock.in/ckfinder/userfiles/files/65363585082.pdf
    • https://mogilew.ru/userfiles/file/buboponimejalipaluzame.pdf
    • http://carszana.com/image/upload/File/42445821959.pdf
    • https://nada70.org/userfiles/file/jiboliwubawajibapavoduvi.pdf
    • http://fulns.com/uploadfile/fckedit/file/16315747317wca.pdf
    • http://ntvietnga.com/upload/files/69299025219.pdf
    • http://apartmany.cucoriedka.sk/data/files/13405003873.pdf
    • http://due.pt/js/ckfinder/userfiles/files/fipiloj.pdf
    • http://denprokhorov.ru/images/file/bedijemo.pdf
    • https://doitoutdoorz.com/file/asckGFWsaZBFgvwc.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=free+pc+game+keys
    • 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_off0000b65d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB65D 16792 bytes
font_01_sfnt_off0000ce74.bin
a25ea0ce330712cf896ae719697aeb33c2ead34a0542e35f9af0aa00b863b149		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE74 10440 bytes
font_02_sfnt_off0000e62f.bin
e4e8d5d509a7d07a994a2476fb97c244876fab5d30193daab3c872699ff3b620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE62F 16364 bytes

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