Malicious PDF — malware analysis report

Static analysis result for SHA-256 18926b17e8924c3b…

MALICIOUS

PDF

78.2 KB Created: 2021-03-26 07:11:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: ce59b828db9d6db0976b28e742d9ffa3 SHA-1: a8384fb8541f7c0ffb8d79440a35ee5fd1225830 SHA-256: 18926b17e8924c3b00b5210c7a39f348bde4e777d2380a1ea1a6b29e2c3d990f
126 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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://zajinet.ru/award?keyword=the+cask+of+amontillado+pdf+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366313/normal_604eaf4d4fa21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444092/normal_5fdfc095dee4e.pdfIn PDF document text
    • https://murovufusefafa.weebly.com/uploads/1/3/5/3/135331463/mosejonerabogol.pdfIn PDF document text
    • http://kegetisa.mygamesonline.org/5020293463.pdfIn PDF document text
    • http://fodujijosezobaw.22web.org/xepilerufoke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480898/normal_60346e26c14ce.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/12fad8d80.pdfIn PDF document text
    • http://pibosezegis.22web.org/doragerosagana.pdfIn PDF document text
    • https://dezijetide.weebly.com/uploads/1/3/4/8/134864221/vorofiworifopuf.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/jaxubuzebe.pdfIn PDF document text
    • http://gekifek.scienceontheweb.net/wolejofoxotaturujukajore.pdfIn PDF document text
    • https://surigogalabilix.weebly.com/uploads/1/3/5/9/135961506/kizoruzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463300/normal_60127e3b8905f.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/ap_human_geography_course_outline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4498366/normal_60455623b3493.pdfIn PDF document text
    • https://xosizinunebazen.weebly.com/uploads/1/3/4/0/134017923/b54e5d77a99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kakapefetabol.rf.gd/poborigepogufabonavanixe.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/24532605635.pdfIn PDF document text
    • http://zejagipusif.epizy.com/does_zmodo_work_without_wifi.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/acromegaly_guidelines_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/nusakemitezu.pdfIn PDF document text
    • http://fojoxolizono.rf.gd/74675222094.pdfIn PDF document text
    • http://mixegudukega.epizy.com/43369610972.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/roland_tr-808_samples_download.pdfIn PDF document text
    • http://zatojuwetowoj.rf.gd/mibala.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF9C 5436 bytes
SHA-256: d8774ddf043d76671de32af09d9610028e93dbe4e7020cbeee231974f3f0542c
font_01_sfnt_off0000f1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1FA 10692 bytes
SHA-256: a4aa9f01ccbf3e73b4a342eaa285d22ab91ca1dff9c3fed6ff6403f117704874
font_02_sfnt_off000115a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115A8 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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