Malicious PDF — malware analysis report

Static analysis result for SHA-256 a267461fd623009a…

MALICIOUS

PDF

73.6 KB Created: 2021-02-23 02:33:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5c5e7a6b77f6be13323aa3d9fd513876 SHA-1: 5a04fa9cd8a24e1f74a8330615cca373639a1607 SHA-256: a267461fd623009a042f8d99d20b8eb683b48344b7108364f6f748ce9dec1151
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, identified as a link farm, with many pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for SEO manipulation or to serve phishing content. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://seumenha.ru/123?utm_term=what+sunflowers+symbolize PDF link annotation
    • https://nizuwutino.weebly.com/uploads/1/3/1/4/131482859/6454468.pdfIn PDF document text
    • https://nomikevokatipo.weebly.com/uploads/1/3/1/8/131859895/7363500.pdfIn PDF document text
    • https://kogozifimasubi.weebly.com/uploads/1/3/4/1/134131491/nimimixewuba_zaguwefezokaxe.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/nujawi-radag.pdfIn PDF document text
    • https://dunomomavelow.weebly.com/uploads/1/3/1/4/131407267/4922762.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461201/normal_5fda46cc01465.pdfIn PDF document text
    • https://velawavasikene.weebly.com/uploads/1/3/5/4/135400921/8118499.pdfIn PDF document text
    • http://ketosimple.online/do_doctors_still_do_house_callsg8r8r.pdfIn PDF document text
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/36108.pdfIn PDF document text
    • https://domafotenok.weebly.com/uploads/1/3/5/9/135973376/naxisazususaja-lovedadu-vodibagirezu.pdfIn PDF document text
    • http://natbeach.space/ethiopian_orthodox_bible_onlineqxg8u.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_603434ef44a29.pdfIn PDF document text
    • http://particulier-societegenerale.xyz/adjustment_program_l380_freenrtsl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://relavidapozo.epizy.com/55299121695.pdfIn PDF document text
    • http://pojiger.rf.gd/magnus_chase_and_the_sword_of_summer_plot_summary.pdfIn PDF document text
    • http://ruxemad.epizy.com/2017_cadillac_xt5_luxury_manual.pdfIn PDF document text
    • http://meralilenizo.epizy.com/apa_table_of_contents_word_template.pdfIn PDF document text
    • http://baxovebiw.rf.gd/19888804573.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d5da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DA 5288 bytes
SHA-256: 13320abf2ae32cfcd51501bfdebe27b69d5307d746b3db4fb661aa587064b54a
font_01_sfnt_off0000e7c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C8 10352 bytes
SHA-256: 4e731ea48f2bdcdef743fdad9b799d9838f692c79980b03215e64b777d928cdd
font_02_sfnt_off00010b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B2A 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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