Malicious PDF — malware analysis report

Static analysis result for SHA-256 617d5721da5acddb…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 23:58:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be7c3c2bfae14578606f07617b278802 SHA-1: 736bfae03ee6272d41e9da902f83da29a033432b SHA-256: 617d5721da5acddb4b33b4031730e56a7cb5e98bbaa1c20cd233ffb24218b41a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded links, many of which point to external websites, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM indicates a mass of external PDF links, and the ClamAV detection as Pdf.Phishing.Trojan-d2568dad23a94d95-10044375-0 further supports a malicious classification. The primary malicious URL identified is vilenefex.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/wix?keyword=soclean+owners+manual
    • http://itasda.online/polytune_2_noir_manualh7txl.pdf
    • http://gayerkan.com/horizon_zero_dawn_sanctuary_talk_to_ferlz4ag5.pdf
    • http://dehydratedoriginalgoodness.com/13899855205nv3di.pdf
    • http://like-store.site/sistema_financiero_internacional_mapa_conceptual0qf0x.pdf
    • http://neojust.ru/penoxeduzunavepifepafaviekeed.pdf
    • http://ideal-it.fun/tecumseh_hh120_specsvdsof.pdf
    • http://hargotel.xyz/college_biology_textbook_online2h7vj.pdf
    • http://klossheff.xyz/akh_lad_jave_mp3_songk25b2.pdf
    • http://mishabelle.ru/microsoft_calendar_template_may_20192gbpa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/vonutavekip/badaxetedejatu.pdf
    • https://uploads.strikinglycdn.com/files/f1b14614-2423-4319-a79c-dad62a3425d3/nagasaxabofusim.pdf
    • https://29ce6865-365c-47c4-9f0a-635d6f965865.filesusr.com/ugd/0d6b77_a4212c4108284032b55ba8e1eee1671d.pdf?index=true
    • https://f3b8d348-8566-49c9-a9f8-a2c3b9e1bc8e.filesusr.com/ugd/f1c748_9866b8d237924f5db3bce2f1ebda999f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/8e4329de-7603-4936-a7b0-1cf93ecf920e/how_to_stop_forced_defrost_on_samsung_fridge.pdf
    • https://uploads.strikinglycdn.com/files/95a8f911-63d3-4a3b-a247-ce1589032a98/limagukexokodewunavusi.pdf
    • https://uploads.strikinglycdn.com/files/93af9284-528b-441f-819b-1d38c0b1cc18/childrens_bible_stories_read_aloud_online_free.pdf
    • https://uploads.strikinglycdn.com/files/3fcbd4ad-515d-4732-9879-43b8406e856f/xasonaralupabakufera.pdf
    • https://s3.amazonaws.com/legenapi/94256960649.pdf
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_269d24594a6b4ef5b43b92ad3d5487f0.pdf?index=true
    • https://d6d3a1c5-32ce-46e9-ae92-c5b8d84d65d9.filesusr.com/ugd/a3b54b_20d864c8c8dc49849bda77c9e062bf38.pdf?index=true
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eaf7.bin
3ef44ed19850560572ec605abecb7c024b8ff3c536f83fd78bdcffed0adef61e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF7 4896 bytes
font_01_sfnt_off0000fb77.bin
c9bc189e248f080219e660b210593cced081077d8a216ff1061b4fccf28ab1cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 11704 bytes
font_02_sfnt_off00012326.bin
e1fcaa290bc8b5aed85f312864440120c61db6abd2add9737883d56687aaee62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12326 16232 bytes
font_03_sfnt_off00013843.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13843 4324 bytes

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