Malicious PDF — malware analysis report

Static analysis result for SHA-256 f883882c8e36cdeb…

MALICIOUS

PDF

75.0 KB Created: 2021-09-16 00:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1f75ec1d7c954398bf786a725bde2286 SHA-1: 69d2551152ea79b94a1fa50909fb992350496441 SHA-256: f883882c8e36cdebf81e186533ffb6604361d51d9081b636f5700ea98266e27e
74 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the document is designed to redirect users to various download sites. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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://topup-fight.com/ckfinder/userfiles/files/vaforujexu.pdf In PDF document text
    • http://maximaviajes.com/FCKfiles/file/fomipipu.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/nemawurowozo.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091605030898879.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/9646385210.pdfIn PDF document text
    • http://mdtrend.hu/files/file/nivafurajupinoxava.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613428eab66db---15020238161.pdfIn PDF document text
    • https://meesens.be/KrMee/Tekstverwerker/58193376797.pdfIn PDF document text
    • http://quesnelfoundation.ca/userfiles/file/92707273483.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/buveruz.pdfIn PDF document text
    • http://nemalipics.com/87504791807.pdfIn PDF document text
    • http://paintmaster.hu/js/ckfinder/userfiles/files/94126396587.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/66663704843.pdfIn PDF document text
    • http://artgrafika.cz/userfiles/file/devoxibuxebudov.pdfIn PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/87598935043.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/zijenuv.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/lasisojazenuxowunibuza.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/vudaxaje.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e7a695037---80227595764.pdfIn PDF document text
    • http://gamax-moto.cz/data/dokumenty/88754346891.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/tivojejeguladimejil.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/gagarixosozoxorogewetovof.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/turugexolufibejefe.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/jesogukov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=sabwap+app+apk+downloadPDF 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_off0000c193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC193 10188 bytes
SHA-256: 47381bb86ae3528564c0c5222a4ed67f9034c9074fa4e16a09458dcc31c8dc78
font_01_sfnt_off0000d84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f060.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 17936 bytes
SHA-256: fa8d0dbe47a06934e021cc090e333d97769d4246faf65ea0b1a80840c64a8f6f

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