Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a029b458525efff…

MALICIOUS

PDF

92.0 KB Created: 2021-05-28 22:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: c633514f732fd6777997054c3b6664a6 SHA-1: 72240cbfd7ddcf6222d68cf220356ce2e6c66f04 SHA-256: 8a029b458525efff58529d5bccfdf96999e28b31e7bdc67dc26e43acaa6f12b3
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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/strik?utm_term=what+does+a+dilapidation+survey+do PDF link annotation
    • https://mafenipo.weebly.com/uploads/1/3/4/8/134879688/d2d1180c224a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466675/normal_5fe0563a9d4a1.pdfIn PDF document text
    • https://pewaruraxifazof.weebly.com/uploads/1/3/4/3/134340131/7ac8cc4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380527/normal_602d94e9d9653.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367303/normal_600363fe5bc33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426059/normal_602be6698f811.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387229/normal_6008d3c534346.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416512/normal_606131e866796.pdfIn PDF document text
    • https://gojodisob.weebly.com/uploads/1/3/4/6/134664442/nusunemafu-xeseroruzudi-zetelut-roroduk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483097/normal_6045073f8985a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422144/normal_6002c2804055d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477886/normal_602713d9eacfd.pdfIn PDF document text
    • https://deperomider.weebly.com/uploads/1/3/4/3/134344929/zalenani_kejagorawubako_papifazot_sakipez.pdfIn PDF document text
    • https://taxuzigapunup.weebly.com/uploads/1/3/7/4/137499287/8520157.pdfIn PDF document text
    • https://soxixafefude.weebly.com/uploads/1/3/4/4/134434462/2464600.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470982/normal_5ffa26a99fa87.pdfIn PDF document text
    • https://xezefamije.weebly.com/uploads/1/3/4/3/134352880/3b8d3e643ee.pdfIn PDF document text
    • https://numusebitekamun.weebly.com/uploads/1/3/4/8/134871234/jaroso_rujululo_jadamexutene_bazofogifeti.pdfIn PDF document text
    • https://fenivubad.weebly.com/uploads/1/3/4/4/134482284/gikimakob-tajawasoko.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/ac1c670842c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1ee23a-2bbc-414c-87df-b5481eb869a8/22129522185.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12789f9e-5338-4480-8d6b-24681757f886/juz_amma_for_school_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2be4db34-d58c-4464-9634-0bf6d3fd114c/how_to_prepare_for_dentistry.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d5996eb-650e-49d9-91de-7634713584ea/what_are_the_characteristics_of_arteries_veins_and_capillaries.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19dab7b4-6f96-4d82-9dc8-bc00d114262e/how_to_start_python_on_macos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be5ec1c5-0743-4669-8dcf-f149abd41748/descargar_msica_gratis_los_caminantes_romanticas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/993d4bbe-7fcd-4308-9c43-53bedc1298d7/51189191393.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_off00012885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12885 5220 bytes
SHA-256: 9c94f618ff1b8f92b0f98ba4b7c195bdb227b122dad44dadce1a31c2859310ee
font_01_sfnt_off00013a57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A57 11812 bytes
SHA-256: 7836f26ed15261b8fd2b8daa557afa36f561173bfc4ca690d925a58dabcf87f9