Malicious PDF — malware analysis report

Static analysis result for SHA-256 c067c003d0738473…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 11:45:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cd594341b910560715a1e00bdd541338 SHA-1: 0d99b9bc2093842aede8268e5e95b56d4ab979ff SHA-256: c067c003d07384731c612b1428380e3bd755436a0f8cb0d9d2018e9becb375ed
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and ML classifiers also flagged this file as malicious, specifically as a phishing trojan. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious websites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=application+of+logic+gates+in+daily+life+pdf PDF link annotation
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/66468034709.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20211004_720EB4148B344A52.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/files/lizozewaninak.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/fujuwi.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/57841543379.pdfIn PDF document text
    • https://kme.pl/global/app/webroot/uploads/file/16306527815707.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/diwekidifabivobep.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613363dec8ebe---24133469109.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/82482789859.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/32967321525.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/gusap.pdfIn PDF document text
    • http://edeins.com/userfiles/file/povenawusobukesisogikase.pdfIn PDF document text
    • https://bisleriwheel.genefied.co/ckfinder/userfiles/files/7881674836.pdfIn PDF document text
    • https://vientangluc.com/upload/files/rewixuganituluwojodepi.pdfIn PDF document text
    • https://libertyrealestate.in/ckfinder/userfiles/files/xumuxoxin.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/77348321474.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/nuvamunefedanenoruwonumid.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109011517077135.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/20387806015.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/37562799936.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/20299481152.pdfIn PDF document text
    • http://goodlife88.com/uploads/files/16308777637.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5eb241ef2---nawozorufoxijefonupis.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/82685976705.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/regagagaxonobifu.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://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_off0000b461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB461 14364 bytes
SHA-256: ad81c90dca60c9cdc83d740184cb374dcfa4e88a29ae7628b26feec1e7521346
font_01_sfnt_off0000d819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD819 10788 bytes
SHA-256: 1973397ce41aeed32d00457c6f922ee0c127f359305c245491ddeda8d45ccc43
font_02_sfnt_off0000f0f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1