Malicious PDF — malware analysis report

Static analysis result for SHA-256 1433947c894931d9…

MALICIOUS

PDF

167.5 KB Created: 2021-04-23 23:35:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fc60dad66dbdea94817ae35ff2994065 SHA-1: dace8215eecbcff1550d764bc306713b727d93a9 SHA-256: 1433947c894931d978b95d0aee6898fcefa00b9c36ab4de8e7c43115237efddb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/strik?utm_term=what+is+the+period+between+the+old+and+new+testament+called PDF link annotation
    • http://mowefopovog.mywebcommunity.org/98974851479.pdfIn PDF document text
    • http://sekelenogake.getenjoyment.net/91469342421.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390996/normal_6032939c22eb8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495684/normal_5ff002cb82cf8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5ff3896817fed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5fdb2eec3070c.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/laforuribugeguvuzufis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462093/normal_604840a0e893a.pdfIn PDF document text
    • http://viresomal.iblogger.org/98511648404.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5fcf9e5382704.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376858/normal_6042cf52bfdd3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_600f02e02d539.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428061/normal_5fe50e00dc7d4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/7254fe53-c847-4925-8f69-867dab1bd3ed/voneviniz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abdeea1c-d426-47c0-bfed-639a0b4460d8/brinkmann_smoker_recipes_ribs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/374b30cc-5792-4cf9-ba31-6a7edca1835f/dell_e93839_az0422_motherboard_drivers.pdfIn PDF document text
    • http://kimajuj.epizy.com/que_es_un_bucle_infinito_en_programacion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50fe05fb-bf6e-43bf-ab67-a1188c03e406/complications_atul_gawande.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0c0dbfc-8cc5-4b7e-a6f4-486c6e295294/daluve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3156f8b-cdb6-46c7-b037-08f2861b1a61/vans_old_skool_platform_black_junior.pdfIn PDF document text
    • http://ribowofipap.rf.gd/august_monthly_calendar_2020.pdfIn PDF document text
    • http://simebowum.rf.gd/jemulepedipadote.pdfIn PDF document text
    • http://zifawikixeliba.epizy.com/aua_guidelines_bladder_cancer_2017.pdfIn PDF document text
    • http://kitilogokufalu.atwebpages.com/emotional_guidance_scale_esther_hicks.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47f8f1e3-8e54-41fc-bf05-45e9ff281e09/do_inanimate_objects_have_feelings.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccf8127e-a7c0-4753-909b-9afa17f21452/taylor_scale_manual_5780fw.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_off000255fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255FC 5556 bytes
SHA-256: f6ede349a1a8a8ddc74c01546b31f265bf7feb19b3d32388c238403ecfb393a5
font_01_sfnt_off000268c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x268C9 11836 bytes
SHA-256: cf578872c3f855d090914cde1d10656e130340fdc78b43e75722db354bc1f628