Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43b9f39a8ed4910…

MALICIOUS

PDF

78.2 KB Created: 2021-04-02 00:08:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96c53932aab71e27533a1a54e534f961 SHA-1: 7ee7740e59840e2432d7b439db682addbd918740 SHA-256: c43b9f39a8ed4910f20d5a3c361f7e067025f258de5cfb9e7ae71b40fd2fa46b
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV and an ML classifier as malicious. It contains an embedded URI pointing to a suspicious domain, vilenefex.ru, which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded content suggest an attempt to trick the user into visiting this external resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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=the+go-giver+summary
    • http://5euro.info/madea27s_big_happy_family_play_freey4ahq.pdf
    • http://forkidsshop.online/kawakawoxetowovoweww5j0.pdf
    • https://cdn-cms.f-static.net/uploads/4450415/normal_606314a771053.pdf
    • https://static.s123-cdn-static.com/uploads/4454167/normal_5feddfc8ea7cf.pdf
    • http://vannabanyavsedela.xyz/80526165587edpwk.pdf
    • http://srakan.space/how_to_update_a_mobile_homelahbz.pdf
    • http://tokio-2020.fun/wosomop93f81.pdf
    • http://sadovik.me/the_harlequin_heart_of_darkness_quotescsq4o.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/muxegeza/41086533440.pdf
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_eb8a6f29caa0473c9dd6ee1f4060a922.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4d718eb3-41b8-43a7-b044-d68dfd0a4c76/ginowikek.pdf
    • https://uploads.strikinglycdn.com/files/aeb616cb-a4bd-4eaf-8d9b-b42be5706e94/volume_of_cone_worksheet_answers.pdf
    • https://uploads.strikinglycdn.com/files/eb5809ff-10c0-4213-8d8e-b5366736f90a/yuval_noah_harari_guardian_review.pdf
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_86083cc25e03463ba96cc2659efa9b51.pdf?index=true
    • https://s3.amazonaws.com/jebokizez/mandated_reporting_training_nj.pdf
    • https://s3.amazonaws.com/zibenoroduzuw/show_me_the_ugliest_car_in_the_world.pdf
    • https://b1e6e3cd-24a2-426a-8b7d-e8f4bd81915b.filesusr.com/ugd/83e584_ff57f1edee7e43c8be75596adb7142df.pdf?index=true
    • https://uploads.strikinglycdn.com/files/4263c55a-7d0e-4b91-aa7f-cd554a33dc72/how_long_is_jail_time_for_awol.pdf
    • https://s3.amazonaws.com/titugome/fly_ludovico_einaudi_piano_sheet.pdf
    • https://uploads.strikinglycdn.com/files/ea3f12b9-9da8-4104-8be3-06e650bb021a/que_significa_soberbia_de_la_biblia.pdf
    • https://b1394492-4877-47b1-8bf2-e962974baa99.filesusr.com/ugd/3e4b7a_753f9e8893484fbfb06f996fb9a2c856.pdf?index=true
    • https://s3.amazonaws.com/wazorixekunafob/wiwaxofusunojupoxasigife.pdf
    • https://abc5f1b3-ad37-4660-b048-d9bff2240d70.filesusr.com/ugd/a1fb68_0686bc34de1c413780ce858faafe9a69.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_off0000f34a.bin
18acb07f30d48d3bb35469174b3b5129845557bbd514d4b159120c7bd37fde60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF34A 5208 bytes
font_01_sfnt_off000104ef.bin
fda8b03824489f8e2e9bf8d68805b6b7661f8a552245e50dac9f87c22d07c490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104EF 11276 bytes

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