Malicious PDF — malware analysis report

Static analysis result for SHA-256 529ff1c3bc049929…

MALICIOUS

PDF

82.5 KB Created: 2021-10-16 05:24:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5adb18bd6b1932437cc69924ab2840c6 SHA-1: cf23fa418a870ee44374b5a4b684b9f54ea7b257 SHA-256: 529ff1c3bc04992913150213b3f2759a5198f8eb1ed8f869a38ffef7822c638e
134 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 for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://franchise-vietnam.com/app/webroot/img/files/47042386654.pdf In PDF document text
    • http://centromp.it/userfiles/files/63880587321.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/65948659802.pdfIn PDF document text
    • http://www.blueoak.fr/image/file/telujedofot.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/44486023251.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/gokiwoxi.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/64084834266.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20211016065617.pdfIn PDF document text
    • https://olterus.info/contents/files/11556332000.pdfIn PDF document text
    • http://unewstoday.com/task/userimages/file/81819663710.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/17051943648.pdfIn PDF document text
    • http://centonze-vini.com/userfiles/files/lalajelikofunew.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/62302305459.pdfIn PDF document text
    • https://valstybestarnyba.com/upckfinder/files/nozidinug.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/18443396636.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16166bc82a4906---4270849481.pdfIn PDF document text
    • https://kaparatt.com/images/File/kapazajufuz.pdfIn PDF document text
    • http://parejalecaros.com/adjunto/upload/fck/files/20205433959.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/kixakavelaz.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/44871221401.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/25045097873.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/66525195035.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/32636546341.pdfIn PDF document text
    • http://1carl.com/userfiles/file/kubakizejubu.pdfIn PDF document text
    • https://corumosmanlimakina.com/js/ckfinder/userfiles/files/wemaxeberi.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/BcFPVxLj4jw/uplcv?utm_term=triple+integration+calculator+with+stepsPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f42d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42D 18232 bytes
SHA-256: b7424317275f96d8a90fbdce381596bb146bc5acfe4fb32f4d4d68ca3ce96fc7
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 10804 bytes
SHA-256: 86f85912eec2a11d0ac0c1663f921735c856202fdb3c0c8a41be21007c71ddf7

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