Malicious PDF — malware analysis report

Static analysis result for SHA-256 223f3b962fa0ce79…

MALICIOUS

PDF

81.3 KB Created: 2021-04-03 22:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fb2293f51ac08c59044059ab3eeed10 SHA-1: 999591ac916c7b94ad8f65ea9c3e190a1aef0f76 SHA-256: 223f3b962fa0ce796246def4d3a5ac4a3c06b12ba63c242a2e2eed8cb840ef1f
164 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier. It contains a large number of external links, suggesting it is part of a link farm designed to direct users to malicious content. The document body, though heavily obfuscated, contains metadata indicating it was generated by wkhtmltopdf, and the presence of external URIs points towards a phishing or SEO abuse attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/wix?keyword=what+are+the+stages+of+clay+preparation
    • https://xejukosaxup.weebly.com/uploads/1/3/1/4/131437924/8577105.pdf
    • https://static.s123-cdn-static.com/uploads/4501198/normal_5ffece685ef5a.pdf
    • https://cdn-cms.f-static.net/uploads/4496580/normal_6040e3996c3bf.pdf
    • http://pokovata.scienceontheweb.net/157125565.pdf
    • https://katozela.weebly.com/uploads/1/3/0/8/130874493/lupulifuvesukejus.pdf
    • https://mijawogutudegi.weebly.com/uploads/1/3/4/3/134374589/xebafi_xomus_muzutasute_gatol.pdf
    • http://janipuwibir.mywebcommunity.org/16741657002.pdf
    • http://bidimiw.sportsontheweb.net/94853631784.pdf
    • http://pobadabodoz.scienceontheweb.net/ccna_book.pdf
    • https://cdn-cms.f-static.net/uploads/4370268/normal_6012348b8c8bf.pdf
    • https://lifulufo.weebly.com/uploads/1/3/1/3/131379971/moxuvuruza-magegopu-palulojelubeb.pdf
    • https://static.s123-cdn-static.com/uploads/4367622/normal_5ff2b98e51bbf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1e8c0764-4a0f-46ab-84a2-5f63a8a44928.filesusr.com/ugd/6a0acf_ce4686afd355415c8fe037600917ff23.pdf?index=true
    • https://1bf92926-22d0-44a1-94fb-b51843c41cd5.filesusr.com/ugd/762c1a_aa42d2ad52fc4f138bb23c5a250fbce9.pdf?index=true
    • https://00f02ae0-031c-4cf4-85c3-86bbc6d7deb2.filesusr.com/ugd/13f2e4_64effe6bef7341049414836c11562a88.pdf?index=true
    • http://lojibovel.myartsonline.com/flower_shop_business_plan_philippines.pdf
    • https://def26600-86c9-4442-a738-094ddf2992d1.filesusr.com/ugd/eb5a6a_171da910f528404a9305d7110ae72edb.pdf?index=true
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_cdd491fba7f747a186b1c40426ad92ce.pdf?index=true
    • https://s3.amazonaws.com/jopomodilamego/gumivebemulaxejajomovez.pdf
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_6e966219a45e4880bd12f374328d33f0.pdf?index=true
    • https://s3.amazonaws.com/mexesazaxasa/quran_arabic_text_with_english_translation.pdf
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_8d421ae286f74cb8bec015e9fc9ad3c2.pdf?index=true
    • https://34e51215-b586-4e01-b3ea-a219475a7b91.filesusr.com/ugd/46481b_af067d4524944c5a9e0b83bf4f4aace9.pdf?index=true
    • 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_off0000fe12.bin
8d057951c70f794aad7db3fe8ee069d581248f0b3ea05586665ef137476a2cc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE12 5392 bytes
font_01_sfnt_off0001107e.bin
6be519768d8a5aec7512741cab7311b6c7b21a9729c3ba4ebb715798d262f4b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107E 11252 bytes

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