Malicious PDF — malware analysis report

Static analysis result for SHA-256 186e98ab23f0246c…

MALICIOUS

PDF

80.6 KB Created: 2021-04-01 13:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9893c8f401f317cf9973359982e20c59 SHA-1: 9e934049173e2f0cb65b3adbcd3c9fca7a7722e6 SHA-256: 186e98ab23f0246c471dea18cc7954a2565cdd5e4cee9da314a5d22c649482b7
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and an ML classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://resalured.ru/strik?utm_term=data+abstraction+and+problem+solving+with+java+2nd+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4420592/normal_6051acc6497e4.pdf
    • https://cdn.sqhk.co/bodujemep/Owhengj/zuvataxubujulugibepabo.pdf
    • https://cdn-cms.f-static.net/uploads/4489988/normal_60636ede49888.pdf
    • http://mitidogifomasis.iblogger.org/95130705659.pdf
    • http://kuzexamipapoxip.medianewsonline.com/gosuvezomowixedopuj.pdf
    • https://cdn.sqhk.co/jimumakevaji/djjOrig/leappad_ultimate_youtube_app.pdf
    • http://tazizinujumijoj.mywebcommunity.org/security_concerns_in_cloud_computing.pdf
    • https://cdn-cms.f-static.net/uploads/4387826/normal_60272f315cbdb.pdf
    • http://vipimuxatomefi.medianewsonline.com/tizolige.pdf
    • https://cdn.sqhk.co/resilano/Xciiihc/39701680635.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wuwedilejom.myartsonline.com/32506664770.pdf
    • https://8e12fe21-47c1-448c-af9e-883e7c84523b.filesusr.com/ugd/52ac5e_6b7810c3907c4f428c756b9994eb7516.pdf?index=true
    • https://711a90e7-97f2-4eab-8690-3003ec1e9b64.filesusr.com/ugd/a0905b_42d8f56227f94c09ae51d2ad0bd99579.pdf?index=true
    • https://4cf2acc4-d143-4013-a78d-f21de0873c4f.filesusr.com/ugd/e4636f_e1ddf26747b6460f9a2767866d85f277.pdf?index=true
    • https://348ddb29-83e1-4812-94a1-743b72ef9b42.filesusr.com/ugd/23b571_3bcfe58f8ba9439e95c67b93b51d7f29.pdf?index=true
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_88d8a54f7dac479e87523efe927d2ab6.pdf?index=true
    • https://2863666b-9d79-467d-9aad-9eeb6dafbdf2.filesusr.com/ugd/6ee3eb_ccd8d4401260449aae7d840306f2c626.pdf?index=true
    • http://kozifina.epizy.com/rowal.pdf
    • https://1580f21e-fc75-4350-9669-3be8b7525729.filesusr.com/ugd/eff6cf_ad7ceca4a94c47a89eb9a7f67ca01c18.pdf?index=true
    • https://59cf682b-6680-4a08-8b8d-0472bab64ef7.filesusr.com/ugd/d7d6cd_2e76a90f22a04891b11783f3e923cd37.pdf?index=true
    • http://gasonuranokojof.epizy.com/85796864761.pdf
    • http://wuwedilejom.myartsonline.com/tomotilanebozedeguvaxor.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_off0000f9e5.bin
59861084151a44d82d2115dc8e90ceff392b6f0b00f85ffee10528e3a456df3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E5 6068 bytes
font_01_sfnt_off00010e7b.bin
28cb6933077e084d8ce83f112bdad390419b0addaeca9839ec8bbbdeb3c3dcb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7B 11536 bytes

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