Malicious PDF — malware analysis report

Static analysis result for SHA-256 d529d34e2e929c74…

MALICIOUS

PDF

81.7 KB Created: 2021-09-10 13:12:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bc3a77af5acc8026e28514377a457ca9 SHA-1: 6fb7faefe4fe1bcbd359150643c978df65f060c2 SHA-256: d529d34e2e929c74f3cabb64314fb8882b23ef30afd944b5e118e001b25532bd
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://websurin.net/UserFiles/File/jimawobanudofalepukur.pdf In PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/60263525074.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210901_FCC34A1ADD7068BE.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fakafaj.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/74127344906.pdfIn PDF document text
    • https://factorysales.com/userfiles/files/xugulurep.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/daposobevilevelu.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/16429043418.pdfIn PDF document text
    • http://gewald.ru/content/Files/redim.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/40223925124.pdfIn PDF document text
    • https://harom.ro/files/file/supizadimimovifuleka.pdfIn PDF document text
    • http://criminisiepartners.it/userfiles/files/25061779204.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/63883959745.pdfIn PDF document text
    • http://odra.cycling-recycling.eu/imgturysta/files/118023276.pdfIn PDF document text
    • https://theurbanthinktank.com/files/losumuxu.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/zamuwebumatugunoparumog.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/a204e5561694e125c94a086af3ef5d7b/43188259919.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/81632498166.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/3461118178.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/62998668612.pdfIn PDF document text
    • http://regmac.net/userfiles/files/238363586.pdfIn PDF document text
    • http://www.moyekolodin.com/files/80875867913.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/11828479337.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///gukevimogarovezap.pdfIn PDF document text
    • https://millvalley.com/wysiwygfiles/file/31009291742.pdfIn PDF document text
    • https://lazdynumokykla.lt/userfiles/file/95563021732.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/88809126437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+iso+ppssppPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f54c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54C 16996 bytes
SHA-256: f1da07aeeeb6170ef8619de0b75727860c536fd67776a2df7a4f5e453548de80
font_02_sfnt_off00012180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12180 10336 bytes
SHA-256: 6c477bd76f8db514730f868193fe664f1fe471e3dd037607af4dee221b0fb9b2