Malicious PDF — malware analysis report

Static analysis result for SHA-256 b71d1ec4737fea35…

MALICIOUS

PDF

76.8 KB Created: 2021-03-24 00:04:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d5c5824f455e6d3ad949d6225dc81fc SHA-1: daf4f95a24c07e2e05cd95c3a1d6bb6fa7367fac SHA-256: b71d1ec4737fea3523a9d63cba8a4a506f61d96f90730a7f0e683819e62c7442
96 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to a suspicious domain, 'pelibifir.ru', which is likely used to host a phishing page or a second-stage payload. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of embedded URIs indicates an attempt to redirect the user to a malicious 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://pelibifir.ru/123?utm_term=anorexia+tratamiento+pdf
    • http://kanobukomovis.iblogger.org/james_and_the_giant_peach_book_report_ideas.pdf
    • https://cdn.sqhk.co/vatukaso/ohige7D/4250280921.pdf
    • http://rakojegad.22web.org/kinetico_water_softener_price.pdf
    • https://cdn.sqhk.co/wimiwupo/gcAQjfe/fx_racer_unlimited_apk_1._4._9.pdf
    • https://cdn.sqhk.co/zukasedu/eheCggk/2020_super_snake_truck_specs.pdf
    • https://cdn.sqhk.co/tefegegesuxe/idgcVK8/stores_that_sell_cake_decorating_supplies.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/21c4b291-414b-414a-a406-f0646aab2d56/62026999082.pdf
    • https://uploads.strikinglycdn.com/files/835e0f76-bd72-4c6b-a6fb-8d18d34fcde9/kirkland_signature_hearing_aid_manual.pdf
    • http://mokimonanogi.rf.gd/72305839041.pdf
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_78ebcc3493dc451384a0765bf02d5d41.pdf?index=true
    • https://0a3880f2-9bda-4900-b484-73a003b8a878.filesusr.com/ugd/3cbe5d_5255f317b57c4487bbd128bd73cde85a.pdf?index=true
    • https://s3.amazonaws.com/solonebosop/24722465893.pdf
    • http://febiked.rf.gd/assassin_creed_apk_offline.pdf
    • https://s3.amazonaws.com/gomakobez/uefa_champions_league_anthem_sheet_music.pdf
    • https://c78ffd2e-fc3d-4272-86ca-968d835fb7ad.filesusr.com/ugd/0f9ef0_c302fc05737643abac51ca5967be4a16.pdf?index=true
    • https://e0fa0743-814d-41de-b6a5-47f787911882.filesusr.com/ugd/89d2ef_906f6e30901e4f1d8fcc01b767b4ae3a.pdf?index=true
    • https://s3.amazonaws.com/toniseligiwuzux/mowuke.pdf
    • https://5fdaa9e0-ad6d-443b-8779-beb8e45026dc.filesusr.com/ugd/05301a_efdf587dd8d44506ac715e63beae89b5.pdf?index=true
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_7092d35762334a80b14cfd9490fd5f0c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0c72d54c-fdb8-4d3e-a8fd-2577872e4819/lanezaronudubep.pdf
    • http://tikigare.rf.gd/bhagavatam_in_tamil.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_off0000f083.bin
95f7a5fa27d1d91125d6dc55c71ef0f9243459960c413aca9029decc190137bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF083 5032 bytes
font_01_sfnt_off00010193.bin
412cdae8ca6e38148f3b8ab388e35af5013156a11e0c27ae1799689b9e7ca1ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10193 10596 bytes

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