Malicious PDF — malware analysis report

Static analysis result for SHA-256 94c7e5920d5d73b6…

MALICIOUS

PDF

69.1 KB Created: 2021-10-03 06:13:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5c0b2f7858cd1c1c17c2a2d10250a07a SHA-1: f7f845cbaf5391cb6532474b97eaf3121280efd7 SHA-256: 94c7e5920d5d73b6997ca1a6904670b9614d7f7ecd3bd69e05e7e04577f31a71
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to a malicious site or download a secondary payload. The overall structure and numerous external links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://webmba.fr/client/logo/file/zinosolakufagumo.pdf In PDF document text
    • http://standardamulet.com/files/files/7835653578.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/58653784214.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/43188103469.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/69016395991.pdfIn PDF document text
    • http://asqcert.net/files/files/redakigujugamikawujiworog.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/jawukuzerojaxika.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/12952505618.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/sadesezumikuboberaxamed.pdfIn PDF document text
    • http://airsoft1.ro/files/file/97040001782.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/pesuditonebujexagigifed.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202191721176453.pdfIn PDF document text
    • http://aylabawadi.ae/userfiles/file/35282803680.pdfIn PDF document text
    • http://hyunshin.net/userfiles/file/vudekujepi.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161300a12ce735---22724831569.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/39237005891.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/dokorosoxulomepirifitozi.pdfIn PDF document text
    • https://thaiahpa.com/flash/files/nunakopopibelivafilaxex.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/monurexefesijufemuw.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/22666029872.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/jiviminos.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/jabapidizofeduduz.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6b4ed9694---53073750867.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/zamodowi.pdfIn PDF document text
    • http://ahknchem.com/upload/files/juxewotadokugop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+swimming+pool+library+pdfPDF 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_off0000b043.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB043 14836 bytes
SHA-256: 85cc032a6245eee269781a0131f92f0d1e4592af6bad791b8c9990e1c6fd7181
font_01_sfnt_off0000d596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD596 11152 bytes
SHA-256: d391614a97303c0b995b60cf527af9c42dd5a2e25b576bfc2738858748e430da
font_02_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1