Malicious PDF — malware analysis report

Static analysis result for SHA-256 cca3123670e6233f…

MALICIOUS

PDF

90.0 KB Created: 2021-06-13 12:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: f1d15e89892b085a1f9af96bc601facd SHA-1: c123d19cbefaf514580a9bd04b41531cdbdd0cf4 SHA-256: cca3123670e6233ff4db735e6b33c9e484688c8d365d2ba87a19f56aca4963be
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, containing a large number of external URLs pointing to various websites. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing or trojan. The document body is heavily obfuscated and appears to be junk data, suggesting the primary purpose is to host or redirect to malicious content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • 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 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://wastran.ru/pbw?utm_term=soccer+conditioning+program+pdf PDF link annotation
    • https://lopowizuxo.weebly.com/uploads/1/3/4/4/134438001/7367997.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490376/normal_600531bec2ba8.pdfIn PDF document text
    • https://levapexufusetij.weebly.com/uploads/1/3/4/9/134904519/e45015e828.pdfIn PDF document text
    • https://tabofeluraratub.weebly.com/uploads/1/3/1/4/131438776/0afe40aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472185/normal_605004ca1d962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413567/normal_5fd7b40151da3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_605a6258875c1.pdfIn PDF document text
    • https://xeravatiwawu.weebly.com/uploads/1/3/4/6/134603636/ronilele.pdfIn PDF document text
    • https://supaxusomit.weebly.com/uploads/1/3/7/4/137499206/raxabaxubek-vedatolowifig-reginakax-tivazewuv.pdfIn PDF document text
    • https://xekesaxi.weebly.com/uploads/1/3/4/3/134317917/d457f05082d8f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405179/normal_60663e5ca7589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408983/normal_60c2c841a6ad0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384164/normal_60037ce4cd7ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_604f32decea64.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_60224d997f0df.pdfIn PDF document text
    • https://konatewed.weebly.com/uploads/1/3/4/6/134692195/subagokipijewunuda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414335/normal_5fe8e0f193aa5.pdfIn PDF document text
    • https://vuduleputasi.weebly.com/uploads/1/3/4/4/134488699/tugezusemuba_vuzopotov_ridupekep_dejolide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417321/normal_6064bba186ac7.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/86479758-09e9-448a-b0a6-167abd8ba726/is_the_green_mile_a_short_story.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fa23258-d3a1-4327-ab9a-868693ece50d/why_do_my_legs_hurt_at_night_teenager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b445d85-7e4c-45ca-a7f4-edfb5788f539/conceptos_basicos_de_fonetica_y_fonologia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49e3af5d-5591-4109-b571-d532fe36bf9e/is_apple_iphone_5c_still_supported.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_off00012288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12288 5368 bytes
SHA-256: f45b4aa602e5c67413d83310eaafaaf7eb0e2f6e683adf95b8f9146cf063fe20
font_01_sfnt_off000134bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BC 11108 bytes
SHA-256: 9f71930fbac4f5c0088578b051da300f7459dbcb32dac937f2ca871f4d65441d