Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c902f9d737f32ec…

MALICIOUS

PDF

75.8 KB Created: 2021-03-24 13:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f063c390d0adc4cc0052099b49fc67b SHA-1: 7681b7e2abb385542a219dad4614aa98143b4176 SHA-256: 8c902f9d737f32ec31dd0d812f489812386ce36bf041047df93de7f756fe83f3
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, with a high risk score. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely used to host a phishing page or deliver a second-stage payload. The document body is heavily obfuscated, but the presence of the URI and the ML/ClamAV detections strongly suggest a malicious intent to redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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/strik?utm_term=keurig+k75+manual
    • https://cdn-cms.f-static.net/uploads/4372384/normal_60418c99d3710.pdf
    • http://svoydvalend.xyz/is_elgato_key_light_worth_itz3uyx.pdf
    • http://teksol.xyz/tratar_la_balanitis_de_forma_naturald0jyo.pdf
    • http://rfs.team/770164846383nf2p.pdf
    • http://devuweza.scienceontheweb.net/ascanio_condivi_life_of_michelangelo.pdf
    • http://sdorovie-sustavi.xyz/what_is_a_certified_divorce_financial_analyst4izfd.pdf
    • http://viziziziv.mywebcommunity.org/49325446006.pdf
    • http://prognoz-football.club/kumidovimiwerunuxr6jz7.pdf
    • http://vidclips.design/genewameviverumukomovappv1qf.pdf
    • http://wijasagasipode.getenjoyment.net/mimadavomoguliwusaponokex.pdf
    • http://zoo-taxi.site/95564699853pnh7u.pdf
    • https://static.s123-cdn-static.com/uploads/4366676/normal_600505499c251.pdf
    • http://xasumemazekejo.scienceontheweb.net/canon_eos_rebel_t5i_700d_price.pdf
    • https://cdn-cms.f-static.net/uploads/4366982/normal_601a053d7fb61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/7f6a9ca5-11cc-4e7e-8f87-81549789febc/54658277951.pdf
    • https://uploads.strikinglycdn.com/files/f16492e3-5d1c-4531-a6a6-cba19ebababc/harry_potter_and_the_sorcerers_stone_cast_dumbledore.pdf
    • http://kivarutumo.myartsonline.com/calculus_book_free.pdf
    • https://uploads.strikinglycdn.com/files/97795529-20d2-465a-9196-60dd4d84d57a/graco_swing_glider.pdf
    • https://uploads.strikinglycdn.com/files/71854ef0-0435-433a-8959-aa6716accb89/ron_paulk_compact_workbench_plans_free.pdf
    • https://uploads.strikinglycdn.com/files/620a8f0c-cb27-423d-b76e-e4358930b5a8/87605082181.pdf
    • https://uploads.strikinglycdn.com/files/8ec9323c-8373-43ae-8630-5f2a6774b2e8/how_to_charge_thermo_king_apu.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_off0000eb1e.bin
23b8a42ab19145b4d09880de0f77aa1a624ad93adbc3adcac4ff952a4146d0e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1E 5064 bytes
font_01_sfnt_off0000fc54.bin
5c238cd6a74db6a95e641550e8334ecd7f314f5d521f2bd5b559139355401bac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 11044 bytes

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