Malicious PDF — malware analysis report

Static analysis result for SHA-256 e85cb79fca1aceba…

MALICIOUS

PDF

113.1 KB Created: 2021-04-30 03:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 59fb51e08720f5307f0119818940beab SHA-1: e0915f4237d23a14c088d72cdff3d3c4ff6cb368 SHA-256: e85cb79fca1acebad5fe1a7e8e65123b9ef8c7f44f4a70cd15424cab74e056d5
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with one specifically designed to mimic a search result for 'what is the largest gaming company in the world'. This URL, 'https://vilenefex.ru/strik?utm_term=what+is+the+largest+gaming+company+in+the+world', is hosted on a suspicious domain and is likely intended to redirect the user to a malicious site. The presence of multiple disposable hosting links and the ML classifier's high confidence score further support the malicious nature of this document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=what+is+the+largest+gaming+company+in+the+world PDF link annotation
    • http://prizinsta365.website/what_does_the_number_333_mean_in_biblical_terms7ch6v.pdfIn PDF document text
    • https://dubiroki.weebly.com/uploads/1/3/1/4/131483307/tedabiwekavapuvadok.pdfIn PDF document text
    • https://fogowedosetoz.weebly.com/uploads/1/3/4/7/134703805/cd4ac92b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386828/normal_602b7364cef0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422877/normal_604b1884a422a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fea27bc114bd.pdfIn PDF document text
    • https://sazefowefojewen.weebly.com/uploads/1/3/4/8/134893887/8297673.pdfIn PDF document text
    • http://beautytopshop.site/defilikifomoluvulowhrw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416675/normal_60145261bfc4a.pdfIn PDF document text
    • https://makesagesuli.weebly.com/uploads/1/3/0/7/130740055/2555595.pdfIn PDF document text
    • https://vexepagofebove.weebly.com/uploads/1/3/4/8/134866030/5292490.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/najubu/how_much_oil_does_a_champion_generator_take.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06277618-6ad8-4dae-8594-d99d7885397a/how_to_install_rheem_tankless_electric_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5791a12-1064-46ac-9554-c30eb413a1c0/suzobasowinozemazomo.pdfIn PDF document text
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_800eaf02b3ad4a33b1144501412cc7dc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a4e15ce-20c0-405c-b666-92d6fa21b8bd/wow_english_course_book_class_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe448c30-e7dd-4810-adbf-9d7d4b00dc1c/20501870847.pdfIn PDF document text
    • https://s3.amazonaws.com/petikamov/fgv_holdings_berhad_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/add_microsoft_outlook_calendar_to_android.pdfIn PDF document text
    • https://ff743420-c5e2-4527-a456-70ddb2a1abd8.filesusr.com/ugd/5178f2_249f6f9cb0604156a8fb57b83d678afa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mawesenasijoser/rerajidojiwofef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbea1d2d-5096-433e-ad9c-8ff648f4f77a/xepajiduz.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/70084111952.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166FA 5696 bytes
SHA-256: 00315679f9b139a9ad898c1854659ade7524f074b2664c718a8dd85ab7fee098
font_01_sfnt_off00017a4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A4C 11548 bytes
SHA-256: f8c7910e4f76e9a8916a0142038d8485f0affae54e890ae3707cd69fff3a6263
font_02_sfnt_off0001a1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B4 16060 bytes
SHA-256: 2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90