Malicious PDF — malware analysis report

Static analysis result for SHA-256 aef1513403f622ca…

MALICIOUS

PDF

78.2 KB Created: 2021-03-31 12:46:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 05f6eedbf0333e137a81fdfc87bad0e6 SHA-1: 3687424d4cc763498307060bdd21f73cf315b83d SHA-256: aef1513403f622ca899e4a4d1b1e240018e27ee1da16288d6a616d909dd91e9a
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs that redirect to various domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/award?keyword=24+hole+chromatic+harmonica+lessons+pdf
    • https://cdn.sqhk.co/zipirevofu/egiibha/drive_finance_company.pdf
    • https://bukusafirede.weebly.com/uploads/1/3/4/2/134266240/mugip.pdf
    • https://pepisukuwen.weebly.com/uploads/1/3/1/6/131606293/nagukonupon.pdf
    • https://gefivepuli.weebly.com/uploads/1/3/4/6/134620723/tiliwaj-detowo-likup-tafaxetaji.pdf
    • http://wujejejifi.mygamesonline.org/49299159976.pdf
    • https://cdn-cms.f-static.net/uploads/4405902/normal_6054402349a55.pdf
    • https://cdn-cms.f-static.net/uploads/4480423/normal_601c5f6bb68f0.pdf
    • http://zitupow.medianewsonline.com/aeration_process_in_wastewater_treatment.pdf
    • https://gokavebaraxev.weebly.com/uploads/1/3/5/3/135309677/978eb4bfdd8b7ad.pdf
    • http://tewatag.medianewsonline.com/zemavomas.pdf
    • https://cdn-cms.f-static.net/uploads/4427103/normal_6011d6acd3f79.pdf
    • https://vuguzazevuzuk.weebly.com/uploads/1/3/5/3/135316601/xudefulizep.pdf
    • https://cdn-cms.f-static.net/uploads/4422631/normal_60434e0f31efc.pdf
    • http://jakusavu.sportsontheweb.net/carnatic_music_book_for_beginners.pdf
    • https://cdn.sqhk.co/tezizejaropu/hejihjs/neo_lms_cost.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bujekotu.atwebpages.com/majox.pdf
    • https://uploads.strikinglycdn.com/files/6c6485d4-4499-44b5-9b8c-31eceb0905cb/zufonikokekafepolamina.pdf
    • https://uploads.strikinglycdn.com/files/9eadfca1-3f42-444f-ac85-5e37d7049b97/91610966954.pdf
    • http://fixiwajavonuti.atwebpages.com/59047306657.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4ab.bin
99b21562d3e52cd22c6f2626ecb055eea0ed82ce38779cb7f7b6757b862dc1fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4AB 5520 bytes
font_01_sfnt_off00010749.bin
5187ae0efd2714cad4fe0205ee9053449e8109c60e137c99944b171cb6151bf3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10492 bytes

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