Malicious PDF — malware analysis report

Static analysis result for SHA-256 08bd3ebcfd367904…

MALICIOUS

PDF

74.3 KB Created: 2021-09-15 21:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f26c9d6a9a878441a8a8fd00f585458b SHA-1: d1bc1bb15a45703ee9ccf85b3005ca0d1f72f382 SHA-256: 08bd3ebcfd36790432118c3339eac7b49d30434d65928e58321aa4a65ca9b275
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, indicating it is designed to redirect users to potentially malicious websites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests a link farm strategy, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://archism.ru/uplcv?utm_term=www+watch+online+movies+com+apk
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/pugonidoviwivem.pdf
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4921373528.pdf
    • http://www.gesas.it/media/mailinglist/file/89453351087.pdf
    • http://el-master.ru/userfiles/file/97732168262.pdf
    • http://vipforiraq.com/userfiles/files/wuluseparejupojo.pdf
    • https://cafesca.org/ckfinder/userfiles/files/pobunewaj.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/vageniluv.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419b97d0d85---nulelalodosajasuxize.pdf
    • http://lpxs168.com/filespath/files/20210909131024.pdf
    • http://www.agenbenangbandung.net/file/webomavuxomalomewemazig.pdf
    • http://podiummoda.ru/userfiles/file/gigagasivevosesob.pdf
    • http://355353.ru/userfiles/file/muruxal.pdf
    • http://zhizhencn.com/filespath/files/20210903021259.pdf
    • http://paolacaone.eu/userfiles/files/jukivixoxirejugekanelitep.pdf
    • http://446888.top/userfiles/file/rozofin.pdf
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/df0cd4157c5731abfb1e15fff69eb7d5/84153195767.pdf
    • http://motocams.cz/ckfinder/userfiles/files/7907527511.pdf
    • http://theffirm.com/userfiles/file/sidivivodetubo.pdf
    • https://onderdurdu.com/upload/ckfinder/files/tofaxokogu.pdf
    • https://lnpro.in/ckfinder/userfiles/files/56363637120.pdf
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/47031788021.pdf
    • http://esejsc.com/upload/files/busolerumovusufirom.pdf
    • https://xn--72ca1bzcdf9cg5df4n5a8cei.com/userfiles/files/75631526029.pdf
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/gijibepepud.pdf
    • 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_off0000c0be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC0BE 16792 bytes
font_01_sfnt_off0000d8d5.bin
ca8b444e961fcf404750b9b56c31efe08566d042477083f432a6e09f9f73b8f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D5 10776 bytes
font_02_sfnt_off0000f185.bin
9a42fa556aa0117b1603e6f25d25e21efac683311318d6f3ad2a0deace933de0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF185 16472 bytes

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