Malicious PDF — malware analysis report

Static analysis result for SHA-256 43e5235d00f336ab…

MALICIOUS

PDF

76.9 KB Created: 2021-04-01 03:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d3598ceb380273d1549561695333bd64 SHA-1: 584817661e6c46c3aff9170584fcf857ea9f4066 SHA-256: 43e5235d00f336abad5a6910eb19c3b01a9964f2add418af8cf396cd37f024a6
126 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It functions as a link farm with numerous external URLs, many hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/wix?keyword=individual+oral+presentation+structure PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419642/normal_602e7ea366c98.pdfIn PDF document text
    • http://afracheat7.xyz/staples_shredder_spl-bxc152a_wont_turn_ontyzgn.pdfIn PDF document text
    • http://dwatches.site/d_link_dsl_2750b_specificationsk7y1u.pdfIn PDF document text
    • http://banki-internetowe.com/noritz_tankless_water_heater_parts_breakdownguz7d.pdfIn PDF document text
    • http://telupizevos.iblogger.org/fafosamowuralupuxedevexid.pdfIn PDF document text
    • http://hardcreditcheck.info/lapefaxatitebufann43s.pdfIn PDF document text
    • http://raicen.com/wipebapevedatexurofezur7a3n8.pdfIn PDF document text
    • http://m-ryanaf.site/55764523296fs2ub.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402250/normal_60239c5c18838.pdfIn PDF document text
    • http://sizoxuk.22web.org/57941175754.pdfIn PDF document text
    • http://nakukamofo.22web.org/80051339031.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447888/normal_5fe3d5919a38d.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zakunafu/27720451681.pdfIn PDF document text
    • https://s3.amazonaws.com/wekibik/zatadebefudakefizawifazob.pdfIn PDF document text
    • http://tetizawoto.rf.gd/wozidudemeripusibux.pdfIn PDF document text
    • https://c4bedd8b-a3e9-4aa8-9751-a6fde4035b7e.filesusr.com/ugd/037f08_e0ea5b32d47a43f8b55afbc487a0edef.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nalifij/japuxa.pdfIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_539c409b9df04d238c61762149487c8d.pdf?index=trueIn PDF document text
    • https://c301b42c-deab-4116-afcd-a09dd0728425.filesusr.com/ugd/4bb894_200211c4c87c40c79ebbd4687f23122c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/wagevijobexugax.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF35 5064 bytes
SHA-256: 8e7eef14b5dd45f09ea9518e734ddbec33ed30ee59fb6e4e0f91eead05b10fd3
font_01_sfnt_off00010080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10080 11188 bytes
SHA-256: 566d4ea152c700556651e7b6aaf22518a5d5f01bea8198e91b0330cccce387d5

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