Malicious PDF — malware analysis report

Static analysis result for SHA-256 534a9770a8f16211…

MALICIOUS

PDF

83.0 KB Created: 2021-09-17 07:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: eafacbf67f1d506efa94a7122353683a SHA-1: 85f40192414e5292e9d5420c33144cb17308d2eb SHA-256: 534a9770a8f16211d691884981471b63fcfc74319bbe292e66f42060cf2b1b20
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for malicious PDFs to execute code or redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is structured as a link farm, likely to obscure malicious destinations or distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://trouver-une-ssii.com/img/pics/files/67201835834.pdf In PDF document text
    • http://upasamed.org/Content/uploads/files/96625530171.pdfIn PDF document text
    • http://printrun.nl/userfiles/files/21740697104.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/tejewusugogovixuxibudi.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/pezejapuserirozuni.pdfIn PDF document text
    • http://prota.ru/upload/files/71593923128.pdfIn PDF document text
    • http://osmed.cz/app/webroot/files/files/53774714544.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/69672915166.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/356d501d99d2e8f7ad55a48dc1d724b4/somusex.pdfIn PDF document text
    • http://titadoorbinhduong.com/upload/files/leduf.pdfIn PDF document text
    • http://pedraferro.com/files/files/fuzodixo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/73665514526.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/vexibududuzabozovul.pdfIn PDF document text
    • https://quangcaowebsite.vn/uploads/files/bazolabemefubisexut.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/9541925447.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/25586414570.pdfIn PDF document text
    • http://hanasushipickup.com/uploads/files/47179526915.pdfIn PDF document text
    • http://fcraregistration.com/UploadedData/file/59744238230.pdfIn PDF document text
    • http://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/25131258070.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/8627380528.pdfIn PDF document text
    • https://habibitours.org/ckfinder/userfiles/files/tulewotu.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/mokapufifefokigora.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/8htcu1qavdmb15hie0r7ur3bcs/gubok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=madden+nfl+mobile+mod+apk+unlimited+moneyPDF link annotation
    • 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_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 10832 bytes
SHA-256: 6b6ee6bc9f8ea8efeec16786112157050d42522f58de211ed8e8b89e454a0934
font_01_sfnt_off0000f8c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D8 17268 bytes
SHA-256: 7f438291f251039deb0e3c9dec2406e98e93bcff89f469f98fa564b949833736

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