Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec309039ad2e11da…

MALICIOUS

PDF

82.4 KB Created: 2021-04-28 00:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 44b35daffdcae637026bdfa8696973b2 SHA-1: 2e6e34103ce987ed0d65cd0fbf51abc6a72046db SHA-256: ec309039ad2e11da562b274f4bb8e8aaf6efc5e0d75b887c867cf13a09b4be32
186 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The embedded URLs and the document's structure point towards an attempt to redirect users to potentially harmful websites, possibly for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://xezojetit.ru/strik?utm_term=change+time+on+samsung+idcs+18d+phone PDF link annotation
    • https://cdn.sqhk.co/vafegijateno/cEYvidh/burekajuwunuzeje.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/ibgjIjd/mejoz.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/jficUpF/gazevewimolalowak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379960/normal_60338c556adba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368977/normal_5ff686089d8b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415518/normal_6054638e87f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528260/normal_60171790f0ece.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408348/normal_5fe299012f8a3.pdfIn PDF document text
    • https://cdn.sqhk.co/zovaratigu/TSEjbgd/download_superbike_racer_2019_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501789/normal_5feb96b9ac0b5.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/ihbgiZ2/everfi_module_2_savings_final_quiz_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5feb797c14966.pdfIn PDF document text
    • https://cdn.sqhk.co/gosukutusu/jbbjfI3/54173940920.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448124/normal_605797c8bd234.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459185/normal_6036212391df3.pdfIn PDF document text
    • https://cdn.sqhk.co/gexedamej/hetWAij/island_of_the_blue_dolphins_audiobook_chapter_3.pdfIn PDF document text
    • http://vutajazelige.medianewsonline.com/82329556659.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jabodegodonirad.atwebpages.com/boripejab.pdfIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_fe960ab94aeb4a3d8a68bb9b56e52a54.pdf?index=trueIn PDF document text
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d7b4b5b4ff1f4b2aa63db397479c1f06.pdf?index=trueIn PDF document text
    • https://ff06b2c9-6223-4357-b4d5-1bf3807c749f.filesusr.com/ugd/717131_025220a8442a4343b9319bc7bf90b2a5.pdf?index=trueIn PDF document text
    • https://7be326e9-a1fd-4761-a84c-83c904220737.filesusr.com/ugd/37e945_12ef4b57ceb54470ad7ab4e3fa4dd4c6.pdf?index=trueIn PDF document text
    • http://zupitatip.atwebpages.com/tegidarixejaj.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A4 5508 bytes
SHA-256: 2ef69f7257186fc430b4d6bda78ae60426b80d2fec0ac682187240c222eace21
font_01_sfnt_off0001083d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1083D 11112 bytes
SHA-256: 893ac869d898a8dae3ee8f108aa59219caba0bc3b77e0187af176bcf42c9a52c
font_02_sfnt_off00012e19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E19 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3