Malicious PDF — malware analysis report

Static analysis result for SHA-256 80c85311ec4ed021…

MALICIOUS

PDF

75.5 KB Created: 2021-03-10 03:02:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: d17f8ffc8eaac09bf0fcf41274f57e32 SHA-1: 5c8e89e2c830ff031767fd21ec56619204e536ff SHA-256: 80c85311ec4ed021604a604ba7141272cfc87393ff5d8912fc72ec570af6b5ab
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a deliberate attempt to create a link farm, likely to host malicious content or redirect users to phishing sites. The primary malicious URL identified is fokemale.ru.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://fokemale.ru/wix?keyword=2+stage+gas+furnace+sequence+of+operation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601995ff4297d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff3f037ac0f2.pdfIn PDF document text
    • http://linodogeb.scienceontheweb.net/que_es_la_inteligencia_psicologica.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/lokufo.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/college_application_process_checklist.pdfIn PDF document text
    • http://kujinatazema.sportsontheweb.net/how_do_i_pair_my_jlab_headphones_to_my_iphone.pdfIn PDF document text
    • http://lomigakorak.getenjoyment.net/hoover_steamvac_silver_spinscrub_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389074/normal_6040b97895324.pdfIn PDF document text
    • http://galufixagomedo.getenjoyment.net/21475070001.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483365/normal_602465cc07708.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487632/normal_5fe9c771ca2a0.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/8826792808.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_543a798756fd47a6adc881e6064566f1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sigobija/astm_a240_a480.pdfIn PDF document text
    • http://wififeju.atwebpages.com/gopiwowofozowiginaxo.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxulikiwab/bibajosedosukoxusubom.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/infographics_ppt_template.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_430236f816da4902baec18b469fde019.pdf?index=trueIn PDF document text
    • http://jamenajiko.myartsonline.com/beck_hopelessness_scale_in_urdu.pdfIn PDF document text
    • http://gonegexunu.myartsonline.com/20251233483.pdfIn PDF document text
    • http://lukafimagog.atwebpages.com/halo_beyonce_piano.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B0 5316 bytes
SHA-256: 78e96adb511629abc5acd97bc3498c5c68de11195318b32418c6fd992e8d8a95
font_01_sfnt_off0000fbd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD9 10688 bytes
SHA-256: d53620f57241a580ec6f29aa5302f290711ce74db4f5122747a39f5097d39d09

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