Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f12b42624ffe5dc…

MALICIOUS

PDF

110.8 KB Created: 2021-04-21 23:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52b69676a65ff0c5c83acac36b13f6a6 SHA-1: 78af1b19badf0082878382c6a3aa619c4f7e5fc2 SHA-256: 3f12b42624ffe5dc2e856f13f009e90b2413398637163eb2a4d2ffaec823a099
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL identified is 'https://jumiwimov.ru/strik?utm_term=excellence+playa+mujeres+vs+riviera+cancun+2018', which is likely used to redirect users to malicious content or phishing pages. The presence of PDF-specific heuristics and the ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 5

  • 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
  • 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://jumiwimov.ru/strik?utm_term=excellence+playa+mujeres+vs+riviera+cancun+2018
    • https://cdn-cms.f-static.net/uploads/4379369/normal_60133e0113c90.pdf
    • https://static.s123-cdn-static.com/uploads/4417525/normal_5fe59cc303d64.pdf
    • https://cdn-cms.f-static.net/uploads/4379602/normal_601949fa3f0e3.pdf
    • https://cdn-cms.f-static.net/uploads/4422628/normal_6054ad65c4d7c.pdf
    • http://sadogiropi.mypressonline.com/fuwalaxofozesomonigurew.pdf
    • https://cdn-cms.f-static.net/uploads/4366652/normal_602aad502e96b.pdf
    • https://cdn-cms.f-static.net/uploads/4413973/normal_5fe64049d876b.pdf
    • https://static.s123-cdn-static.com/uploads/4443574/normal_5ffc3452c0bf0.pdf
    • https://cdn-cms.f-static.net/uploads/4422163/normal_5fe6508cee5cd.pdf
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fc8bd92cbbf9.pdf
    • http://wumupowon.22web.org/82043812413.pdf
    • http://gebikomuxe.getenjoyment.net/52555175017.pdf
    • https://cdn-cms.f-static.net/uploads/4458826/normal_5fe9e0078cfb0.pdf
    • https://cdn-cms.f-static.net/uploads/4487658/normal_605d93eba1409.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_600ae37c4cfba.pdf
    • https://cdn-cms.f-static.net/uploads/4369316/normal_604dd0a2243bf.pdf
    • https://static.s123-cdn-static.com/uploads/4419002/normal_5ffc59c71ed27.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://9170d309-caca-4186-8987-bf6b40ce219c.filesusr.com/ugd/baef12_5d9760f7a41e4cedb654804a135313c1.pdf?index=true
    • https://93a2b5bb-aecd-41dc-861f-07dcdefec443.filesusr.com/ugd/dee83c_55654bacf3404337be1b0dd45989c320.pdf?index=true
    • https://ef733714-782c-48ea-8991-1bc0bf0c95f2.filesusr.com/ugd/ad2ade_c3ace822ce784108a5da765b4ef8ee90.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_a576b20247cf4b93af2995077b0a6c6c.pdf?index=true
    • http://tofilijewok.atwebpages.com/81981861137.pdf
    • http://lezegunotoxom.rf.gd/busobilakigana.pdf
    • http://nilipinuz.rf.gd/cancer_de_colon_medigraphic.pdf
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_93180f19d6144d7b9b3e30d545540e00.pdf?index=true
    • http://zodomufofojijil.rf.gd/68287956870.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000164d3.bin
8b7e76c1f9736cb6826534e0f21329f537ab1e14c5fd659655445e472479d10c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x164D3 5556 bytes
font_01_sfnt_off000177a2.bin
7e123babe5b8d0f4dad264a5c5245cbb359519a6287cb546e2e196e35d751103		 pdf-font-stream PDF embedded font (sfnt) at offset 0x177A2 12260 bytes
font_02_sfnt_off00019f55.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F55 4324 bytes

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