Malicious PDF — malware analysis report

Static analysis result for SHA-256 0836ab6477a6f87e…

MALICIOUS

PDF

90.1 KB Created: 2021-09-13 01:21:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 54cf8ffbff065420077fcc7eef7194bf SHA-1: 300bd0b28fd0a99b7550eca4fb50de9dba5fca7f SHA-256: 0836ab6477a6f87e76868bfc5e9333a1f154fa8a19bca8ff0277c0d181917a81
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://sweet-sugar.de/images/uploadedimages/file/dirozitibokivakiveniporas.pdf
    • http://architetturaurbanistica.it/userfiles/files/vewigoguviv.pdf
    • http://meditopthailand.com/file/wefubeminozerujura.pdf
    • http://tzoetemondje.be/uploads/files/43419095299.pdf
    • https://dansobentre.net/uploads/file/28184591192.pdf
    • http://musicfriend.vn/public/default/ckeditor/files/dakep.pdf
    • http://fullerton.kopanramen.com/uploads/files/kowekeboravarenuk.pdf
    • http://quiltingacademy.net/fckeditor/userfiles/file/59062879445.pdf
    • https://portalkucharski.pl/app/webroot/media/files/zezunixum.pdf
    • https://cicasoftavukatwebsitesi.demowebsiteleri.com/upload/files/34979241508.pdf
    • http://albarossa.jp/js/upload/files/62244109316.pdf
    • http://www.como-grup.ro/fisiere/file/zajofelafuzasan.pdf
    • http://turinhotelcompany.com/userfiles/files/bizubulusugipodesufiwufig.pdf
    • http://efuegypt.org/userfiles/file/jagepijanegamefun.pdf
    • https://pristineleather.com/userfiles/file/sivonuro.pdf
    • https://gsm.company/ckfinder/userfiles/files/41541183423.pdf
    • http://smarttechsolutionukltd.com/uploaded_files/userfiles/files/7976849814.pdf
    • http://studiodrago.eu/userfiles/files/72049235507.pdf
    • https://helicopterleasingservices.com/userfiles/files/52599643512.pdf
    • http://davidhammerstein.org/ckfinder/userfiles/files/gozotokosudoponofexamudu.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a6b9a2051---34097005258.pdf
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/kukatatolavonag.pdf
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/93542891905.pdf
    • http://mnogonomerov.ru/uploads/file/boweza.pdf
    • http://domainecomps.com/documents/files/12170097360.pdf
    • https://newfrio.com/userfiles/files/lawiwopufavoredax.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=best+android+os+for+pc+gaming
    • 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_off0000fa2b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2B 16792 bytes
font_01_sfnt_off00011242.bin
2be81fa988274d8715d7bd8cf4cc8cd5852e223b037e790de9d36e2fbb57e824		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11242 10968 bytes
font_02_sfnt_off00012b88.bin
676b8775d2ae0bafd21367316829796e8eb134bcce7383de1b4f324e9202baf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B88 18420 bytes

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