Malicious PDF — malware analysis report

Static analysis result for SHA-256 794146fccdd66988…

MALICIOUS

PDF

90.6 KB Created: 2021-03-29 13:24:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 862660a7bef2b3d51acfaa839c66555d SHA-1: ec5158638e2031924bc909443b7a4a3ab83827d6 SHA-256: 794146fccdd6698849ccdf6ea5a6b81b91ebcaafabf26ab93afd0534c4d3cc73
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vilenefex.ru/123?utm_term=filmyzilla+2018+bollywood+movies++hd+720p PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4410674/normal_6020a37ea6b86.pdfIn PDF document text
    • http://usesol.xyz/chicco_nextfit_sport_convertible_car_seat_manuales2jq.pdfIn PDF document text
    • https://suvenalopevoku.weebly.com/uploads/1/3/4/5/134510495/7720963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383924/normal_5fda1cab1753e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373985/normal_603f7a919e28b.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/jovagukabalo_soxoj_fakesetagobum_laworiba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444647/normal_5ff9c7c418701.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457577/normal_5fd835b6a7232.pdfIn PDF document text
    • https://fofirajajamide.weebly.com/uploads/1/3/4/6/134643930/feremezeluve.pdfIn PDF document text
    • http://1xbets-reg.site/simcity_4_free_download_full_game_windows_7zioj1.pdfIn PDF document text
    • https://wugowimuvup.weebly.com/uploads/1/3/4/7/134762233/vowebikil.pdfIn PDF document text
    • http://hellochildren.online/91806578641xhd0g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392877/normal_605c1d6142526.pdfIn PDF document text
    • http://googsnat.space/free_wordpress_plugins_for_ecommerceqdera.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420599/normal_5fd97c85ba927.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/76b98eec-2605-405f-bbd4-febd102e0c3e/descargar_anthony_santos_popurri_bachatas_viejas_en_vivo.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/20306359024.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/sentence_errors_exercises_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nijudow/energysage_buyers_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74fa7afc-f4ea-48e7-9fde-2876f0f33117/55839456723.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a87962cd-e67d-4fc8-b1ae-f46931f4f024/tivitujowololazov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff7a4f2-0daa-4797-b477-1f32cff05040/rajorif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f74bd1fc-24bf-4a22-8655-44f4888597da/62037838668.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_off00010b81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B81 6100 bytes
SHA-256: 51a6b36f3484a37bd06fe36809ac767a292c3f3a1a8591037982dd0b17b01ff4
font_01_sfnt_off0001204b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1204B 11312 bytes
SHA-256: 32760e12b61a5cb9c19caf397a27a2ac73357832987d3ed3b0d4a1d07f5d58e2
font_02_sfnt_off00014707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14707 16280 bytes
SHA-256: 35373c206b5bb698d9a0cdbe8d37cd6f028d3ee2cb4689727975a50e156521e7

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