Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fba75445fad5e48…

MALICIOUS

PDF

84.7 KB Created: 2021-03-25 17:25:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 802fa810afd6a114798ae08f1075bed9 SHA-1: eacaa41da35ea3b72aa4c09c3bdf6b7b8e6f13df SHA-256: 4fba75445fad5e48189a6874e2cc5dc2f9fd130114ce60efc0f0557254043595
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded URI points to 'https://nipisod.ru/strik?utm_term=whirlpool+fridge+parts+diagram', suggesting a lure to download a second-stage payload. The document body, though heavily corrupted, contains metadata related to wkhtmltopdf and a date, but no clear textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/strik?utm_term=whirlpool+fridge+parts+diagram
    • http://qrettalq.online/atlas_copco_compressors_canada_montrealxw007.pdf
    • https://cdn.sqhk.co/zasokolof/dBPiahh/minecraft_dungeons_wiki_armor.pdf
    • http://tgesheff.xyz/fortnitemares_challenges_guide_20192tld0.pdf
    • http://nafigunagofadab.getenjoyment.net/marvellous_techniques_for_ielts_writing.pdf
    • http://xevalarebufop.22web.org/secp_auditors_reporting_obligations.pdf
    • https://cdn.sqhk.co/libuzewis/fijDgj6/shelter_in_place_san_francisco_order.pdf
    • http://lazotub.mywebcommunity.org/atresia_esofagica_fisiopatologia.pdf
    • http://storeeu.info/baby_bjorn_original_carrier_instructions_front_facingd68e3.pdf
    • http://circus.market/91286376778la7wv.pdf
    • http://ridovise.sportsontheweb.net/kewolixidolafaz.pdf
    • http://didezidise.22web.org/kolarab.pdf
    • https://cdn.sqhk.co/naxusepimosa/jdigBf5/95561162086.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mibexalaxesu.epizy.com/an_abrupt_climate_change_scenario.pdf
    • https://5071cc05-3fa2-46b1-b944-d2523ca4b51d.filesusr.com/ugd/62e2c1_442452b1727f456a9198ab36686ef0f5.pdf?index=true
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_5913eb0ad89540f38dc03bdcd7a99dac.pdf?index=true
    • https://13a2bf7a-7930-4518-a7e6-737bf3c0aa4f.filesusr.com/ugd/f5c1a0_bb2424a955844601a834d620c4e3ec4e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4707aadc-77d1-4778-a97b-bd7d707a3039/d-link_dap-1360_reset_factory.pdf
    • http://xasazotim.rf.gd/meeting_confirmation_email_template.pdf
    • http://noratev.myartsonline.com/liber_null_e_psiconauta_portugues_download.pdf
    • http://bejovivijif.epizy.com/62912461212.pdf
    • https://uploads.strikinglycdn.com/files/076d0d67-b52f-4131-822e-2e517be1170d/61713428595.pdf
    • http://segurixuzek.myartsonline.com/94614221364.pdf
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_09fa0b9c60fc49958e68cda4124c6a23.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_off00010d52.bin
c43f8619b85721cf33213caad2f26793f2b26768df060e5cb92be19a32eacef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D52 5468 bytes
font_01_sfnt_off00011fd2.bin
9e3a8d2446ad6023ff906c37b421416a7db3cfec6f762fd98f38c8c1fded068c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 10500 bytes

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