Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ba8c342bee793d3…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 14:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: db7c7df0f23a5c95a37a2c558df540a7 SHA-1: 175ff3038d6e64eed63be23ba142c7a253c9c6c0 SHA-256: 8ba8c342bee793d3ae3490c9a332fb7dac4b6969179b7578735ed64ffb08a853
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of embedded JavaScript and a large number of external URIs, many pointing to disposable domains, suggests a phishing or spam distribution scheme. The document body, though heavily obfuscated, likely contains lures to trick users into clicking these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://volgogradexpo.ru/ckfinder/userfiles/files/91847657371.pdf In PDF document text
    • http://www.binghan.my/userfiles/file/mogabakugumi.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/vurapazigalafananax.pdfIn PDF document text
    • https://akapacha.com/userfiles/file/vesoxejugagofesuwojaleba.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/60226365352.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/rumumupumevelotakow.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/19830457449.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/69840285902.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/lixolikufodupamagefaxoxa.pdfIn PDF document text
    • https://www.twibiotech.com/plugin/ce1/ckfinder/userfiles/files/sazibixuzalefadago.pdfIn PDF document text
    • https://sunsetlearningcenter.com/userfiles/file/josuzu.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebec0da373---dewowedodusogoviv.pdfIn PDF document text
    • https://dobski.pl/userfiles/file/68101139202.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/sotipekazamubalesoruragaj.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/rumufoletubevovawozazepo.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/23625728033.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/fipuxiwuzopapegome.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/248a2a00280713fb7f7c276d395e280f/98855530348.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/73709336846.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/varozodujokas.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/80590885826.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/81450876625.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=best+moba+android+2021PDF 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_off0000edc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC4 17576 bytes
SHA-256: 34c1fc8f61dc3d5f20d3c39fddb9f3eae60ee7615f70ae9b5db46d3323fbc8f8
font_01_sfnt_off00011b42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13359 10848 bytes
SHA-256: f1cc1bab6ce89431371b44c1d134e72967f11d1584adeb6a0ee66c4cc4b8705b

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