Malicious PDF — malware analysis report

Static analysis result for SHA-256 de384d4d74628c78…

MALICIOUS

PDF

81.5 KB Created: 2021-03-15 02:38:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a99deff00f37c0b369c50ca025261211 SHA-1: b2853bebab9caf458a37c6021688e215f3ecc6e8 SHA-256: de384d4d74628c780cc37d9895e98bafdd21855a52bec97f2c29314935cd59c3
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to external websites, with several identified as potentially malicious or part of a link farm. The ML classifier strongly indicated maliciousness, and the PDF structure suggests it's designed to redirect users to potentially harmful content, likely as part of a phishing or scam campaign. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://zajinet.ru/wix?keyword=bowl+of+cereal
    • http://pazexorosit.iblogger.org/tafsir_ibn_kathir_english_translation.pdf
    • http://dobofozepop.mygamesonline.org/caterpillar_416b_backhoe_service_manual.pdf
    • http://vijevejumozugim.sportsontheweb.net/how_to_make_lg_front_load_washer_spin_only.pdf
    • https://cdn.sqhk.co/gisopagipize/fFvidii/20027589206.pdf
    • https://cdn.sqhk.co/savujegu/u0lhigi/84401055851.pdf
    • http://limowoduramu.iblogger.org/govilasigamegamixavefite.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://592908bf-dd96-48cc-88d9-ffebbdd10d84.filesusr.com/ugd/f34823_2e9cffbf470d4b6790f518b01daa3886.pdf?index=true
    • https://s3.amazonaws.com/wejuvono/15339276990.pdf
    • http://megozesupulop.rf.gd/elsinore_game_guide.pdf
    • https://7980b0ff-2efe-48f4-a442-6c87bca80713.filesusr.com/ugd/9bd8c3_ad2e92272a9c4d3e88195a12d2103764.pdf?index=true
    • https://7915398d-c9c2-4241-abdb-40cf742e4b8d.filesusr.com/ugd/d4df0f_c0a14b0b7d8942ccbdda5c457e320b5f.pdf?index=true
    • https://uploads.strikinglycdn.com/files/41cf9f3d-c02c-4676-9f1c-bc623ba07f49/sony_blu_ray_bdp-bx59_remote.pdf
    • https://uploads.strikinglycdn.com/files/4c5f04c1-308b-4f15-b8a0-6d7d160276fc/australian_business_law_book.pdf
    • https://s3.amazonaws.com/gogoxowiniza/22508954015.pdf
    • https://4eff3ec4-d147-45d1-be73-876d9e1d0019.filesusr.com/ugd/efb3f0_f473886e8f1e4960a4db120368d9b052.pdf?index=true
    • https://5e3b32e6-a537-4a58-a531-ef303a468713.filesusr.com/ugd/120874_ae304b95a5334eeca0e18d2a13635cf7.pdf?index=true
    • http://turitize.rf.gd/leruxo.pdf
    • http://tulajadulixo.myartsonline.com/tuzazemosonivejumumuzi.pdf
    • http://winupenelipumo.epizy.com/landscape_estimate_template_free.pdf
    • https://uploads.strikinglycdn.com/files/dfbaf189-fc5c-4621-aa10-4f90be07c4ed/how_to_repair_a_whirlpool_cabrio_washing_machine.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010139.bin
c46bef80bd124148237aaee7a6d9d9c0111f76f858250a5901c570118e81158b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10139 4840 bytes
font_01_sfnt_off000111d7.bin
d19da9e51b5f39d302c690166f34e15508dc8c416c00a8536bc5d01d2b1dad06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111D7 11592 bytes

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