Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d9b66d634740cf3…

MALICIOUS

PDF

77.6 KB Created: 2021-04-05 10:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f75e8f35af11ad7f2911521a43efb05 SHA-1: 2472b9120b21e96805fe8cb4bbda69b8bac77fd8 SHA-256: 3d9b66d634740cf31bb396dc76ac7c11d1a92422d0b360054c0ffd15f05ca797
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains numerous external links, with the heuristic 'PDF_SEO_LINK_FARM' indicating a mass of external PDF links. One of the primary URLs extracted is 'https://lozipotod.ru/123?utm_term=biodegradable+adalah+pdf', suggesting a potential phishing or SEO manipulation scheme. No scripts were extracted, but the presence of external links points towards a malicious intent to redirect users to potentially harmful content.

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://lozipotod.ru/123?utm_term=biodegradable+adalah+pdf
    • https://cdn.sqhk.co/nijalemivowo/eidbje3/nubuvap.pdf
    • http://rolopigabetitu.scienceontheweb.net/ladugegugarigizepotom.pdf
    • https://cdn.sqhk.co/miwavilusaji/Wif4xhi/58273281419.pdf
    • https://cdn.sqhk.co/zuxeromewime/Uxilig0/kopovelokivilobonofob.pdf
    • https://cdn.sqhk.co/farukisinu/dJijc4q/combat_commando_secret_mission_free_shooting_games_download.pdf
    • https://cdn.sqhk.co/tarudifirew/hhFiigh/6467988856.pdf
    • http://lezepubaj.iblogger.org/bsc_magazine_january_2020_free_download.pdf
    • http://tokilekitikas.22web.org/python_bottle_request._forms._get.pdf
    • https://cdn.sqhk.co/dopuzodopuvu/ddgfVja/absage_angebot_freundlich_formulieren.pdf
    • https://cdn.sqhk.co/susojareb/ggeu6T4/nwsl_expansion_draft_2020_predictions.pdf
    • http://beririka.scienceontheweb.net/63108212967.pdf
    • https://cdn.sqhk.co/loxufore/cgfUcib/shooting_games_for_android_2018.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://5d3a357a-25b2-4459-9cd8-210b235f7b36.filesusr.com/ugd/45e30f_ed724c286d4f4ef1a9e9e16da4c0158a.pdf?index=true
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_99c4fc7432664462a594bd8fd94e9303.pdf?index=true
    • http://rolezudebozi.rf.gd/80511094729.pdf
    • http://mexexumekevuk.rf.gd/auto_frisian_dew_grow_report.pdf
    • http://tuxabatadifu.onlinewebshop.net/rent_agreement_format_pune_in_marathi.pdf
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_c900eaeb3bbc4296b41d34608f7b20f3.pdf?index=true
    • http://nitukerisoz.rf.gd/exercicio_de_atomistica.pdf
    • https://e0f910ba-f4aa-4d6b-87f6-24d78cda99ab.filesusr.com/ugd/cc15ef_e04ac5c4c7594d0fabe0367af6f05605.pdf?index=true
    • https://e942959e-95af-4115-ab05-a6e38533eaad.filesusr.com/ugd/66f7a0_838d0ff961d343a29dfb5216a1d859ed.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f060.bin
9ce9a5d99763c7c5fbaf643cfc96adfeeb89fee7f13a03c6c54f71b4bdbaa905		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF060 5312 bytes
font_01_sfnt_off00010267.bin
e4e54164096ce078963a069442527e86b83a1460e389235c965679230a66697d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10267 11304 bytes

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