Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88964367de723f9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-17 16:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ec83926a7465fec17c465b20c8933caa SHA-1: 3e4724ef09335a89dfeac22cc90094b89480c44e SHA-256: c88964367de723f9abad08fd41aae1fc8bd28f08da21d1b5088f6840a26d0b1f
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to trick users into downloading a secondary payload via the embedded JavaScript or the linked URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://pixomot.ru/uplcv?utm_term=little+kitten+apk+download PDF link annotation
    • http://gyogytornasz.hu/editor_up/96863220386.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/55846939920.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/5v5pptetb36oma6jauur2cnvjt/721608369.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/javenotavotasoxamugudajez.pdfIn PDF document text
    • http://paneldeconso.com/userfiles/file/90229441879.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/29863338411.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/75371298120.pdfIn PDF document text
    • https://frisch.ro/files/file/jajixame.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/mugimil.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/3f49960f4be8974431795fcdb9ec7f9b/69203535238.pdfIn PDF document text
    • http://moneymaker-gold.de/files/jejuk.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/gufowesokewikul.pdfIn PDF document text
    • http://ekopaczka.pl/imgbrama/files/61693946611.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/83794697324.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/jufitivuzojozijifamexo.pdfIn PDF document text
    • https://tradingphrases.net/userfiles/files/vikijusemawenuborix.pdfIn PDF document text
    • http://luxlustry.ru/img/upload/fabigufotukepafekifodetat.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/tedovuzujowesesiropelixij.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/95495716496.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dijunutimidazavopikigu.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/luvejupilemozixe.pdfIn PDF document text
    • 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_off0000d728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD728 10252 bytes
SHA-256: 9146615044268775c96ed7a3bc58f74370aeeda67d56ad388fa78cf314993382
font_01_sfnt_off0000ee48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE48 18608 bytes
SHA-256: 2f222aebab72fd6a53d22862e6aea6ae15d2d9922f6f38824ad3de39643460c5
font_02_sfnt_off00011e29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E29 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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