Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfd7c59e239f3d9b…

MALICIOUS

PDF

114.1 KB Created: 2021-03-12 17:46:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 1ae2d19acad91723c6c5c87bcc5f6407 SHA-1: 2065533de26bd566e91908439eaf25b45832719a SHA-256: bfd7c59e239f3d9beb49ae5bc073ae2930dee174027c39ab1c52ec111359fd87
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of embedded external links, suggesting a link farm or SEO manipulation tactic, with one URL pointing to zajinet.ru and another to feelslike35.com. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, but no executable scripts were found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=pt+bd+sharma+date+sheet+pharmacy PDF link annotation
    • http://feelslike35.com/bill_cipher_wallpaper_android35s99.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493920/normal_60165a4a05bfc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449001/normal_5fd86d043c557.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389794/normal_5fdbc5c3d9a59.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380857/normal_5fd5f9f2c7d6f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447087/normal_604a1475cb115.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462379/normal_5fe61bf5636bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505837/normal_603e53d654318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417329/normal_602fa558ad987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_5fe97df666cc3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_6003e18884076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366047/normal_6008f02c00553.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/what_does_the_health_department_do_if_you_test_positive_for_covid_19hkekj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d7179dab-c972-4501-9f4a-16044ca71e84.filesusr.com/ugd/434f74_dcb48c6586d6413198e63bf6f7bffeee.pdf?index=trueIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_fe5a4fa37d9344799e5a2265ca3f301c.pdf?index=trueIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_9b1def1c3bf84244b58bec1845475bc2.pdf?index=trueIn PDF document text
    • https://507d1b22-ea03-4061-a262-f79425337ca2.filesusr.com/ugd/a374b9_3f9077a8a5cd473ab3eded3e019166de.pdf?index=trueIn PDF document text
    • https://29c5b005-6627-40e3-9da1-9f9d3dbc34dc.filesusr.com/ugd/7ad284_98bd6372e04f4ad883cd1fa2a4c039f8.pdf?index=trueIn PDF document text
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_0e4a6b3730594488bde950ebb2b5fe2c.pdf?index=trueIn PDF document text
    • https://f499a9ea-5579-4d3c-a180-ba191067f9b7.filesusr.com/ugd/34ec99_57cae0a6afa4479bbd8942a2854a38ae.pdf?index=trueIn PDF document text
    • https://229c3593-bb94-4e5d-9b9f-ca3747df48ef.filesusr.com/ugd/145364_248cc2c12ada49c6a1585253cf2faf4b.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17463 5048 bytes
SHA-256: 37b01606cd7325f9f906f264a3761f9bbf44213e9e92619ba2f466ca2630b916
font_01_sfnt_off00018588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18588 11400 bytes
SHA-256: bc17907582695631ccc76f028c8a685f8041e7c848b5844874c4b2420a1c5479
font_02_sfnt_off0001ac36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC36 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.