Malicious PDF — malware analysis report

Static analysis result for SHA-256 75232c5ee7de62fc…

MALICIOUS

PDF

79.8 KB Created: 2021-04-28 05:55:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 627b4298d55a7e1e89728516fb058718 SHA-1: f1b0ea34a211812bfadc8df42e0f0d28934034e9 SHA-256: 75232c5ee7de62fc5b3df51fe144dc39d65772040391e7c0083a5328fb651909
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. The PDF contains a large number of external links, many pointing to disposable domains, consistent with a link farm used to distribute malicious content or phish for credentials. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest this is a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=chi+keratin+mist+use PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366947/normal_5feb177255484.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489414/normal_5fea27627752a.pdfIn PDF document text
    • http://sethel.xyz/fast_browser_video_downloader_private_video_saver_apkoq2kf.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470836/normal_5fc752a5ba0fc.pdfIn PDF document text
    • http://tertov.xyz/43988671517afkc9.pdfIn PDF document text
    • http://budokudepa.scienceontheweb.net/adobe_reader_download_windows.pdfIn PDF document text
    • http://tideboweped.medianewsonline.com/vujuxamegu.pdfIn PDF document text
    • http://joxutikomujawi.iblogger.org/14280454956.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/bank_management_system_project_documentation.pdfIn PDF document text
    • http://fumexijana.getenjoyment.net/6529980690.pdfIn PDF document text
    • http://pubggaming.online/90563148324xeco9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489843/normal_600361b0290f2.pdfIn PDF document text
    • http://fullstacket.online/grade_5_paragraph_exampleszrn7c.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/p90x_workout_meal_plan_downloadnzlif.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/blue_jays_2020_schedule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483604/normal_60287d4b8a8fa.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/jozaponi/vudetuvefaweveremix.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/how_to_extract_magnesium_from_its_ore.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/68860792193.pdfIn PDF document text
    • http://bipedok.epizy.com/58317767266.pdfIn PDF document text
    • http://texozokuvet.epizy.com/expanding_single_brackets_with_surds_worksheet.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_off0000f013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF013 4860 bytes
SHA-256: e5fd548bad16ee77c020947b493a4c8c74769942a79be183d3551e20f424a1ae
font_01_sfnt_off00010063.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 22656 bytes
SHA-256: d5db9b28ef218d837dd996f0af9915001ede5aaad82e4ac90cc9a26309c80a35

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