Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a64fdcf7c90cf9c…

MALICIOUS

PDF

68.0 KB Created: 2021-09-30 11:49:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0433d579a6dd4a27e46b2f76c9441ea3 SHA-1: 436dc7a70dabbc2813524c20003a614f950c908d SHA-256: 3a64fdcf7c90cf9c874082ebde5cf41cba0b16660936cee5be0446429342f474
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it functions as a link farm, directing users to multiple distinct domains, one of which is hosted on a potentially disposable domain. The embedded URLs suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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 http://fuzoku-kyujin.jp/ckfinder/userfiles/files/35607690803.pdf In PDF document text
    • http://sjzhtchem.com/upload/files/xofuxifek.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/52157020205.pdfIn PDF document text
    • https://mekongtransport.com/upload/userfiles/files/jigokuritapesopifalovive.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/31121386787.pdfIn PDF document text
    • https://yenicekentkaplicasi.com/userfiles/file/88817644802.pdfIn PDF document text
    • https://togeltop.net/contents/files/44750410556.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/20255792171.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/begolonarimopumas.pdfIn PDF document text
    • http://hun777.hu/_user/file/61180780682.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/wamopil.pdfIn PDF document text
    • http://www.herbertvanderbrugghen.nl/draft/68566172354.pdfIn PDF document text
    • http://tradotel-riviera.com/file/1859742657.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161414ca09d458---nesedofiritufakudebinapa.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/62645209327.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/c98c2106af9f4e9c5b28b44885ad9a5d/wukaparem.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/5521185978.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/zitolepiniwibajevefiwo.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/magisoraxalor.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/vagofewapok.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/37573862901.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/vodumekadofeta.pdfIn PDF document text
    • https://rwd.webseo.tw/upload/files/40454724403.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+apk+movie+appsPDF 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_off0000ad85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD85 10372 bytes
SHA-256: 69a8267997d65add59c24568d901336f3d27d11f1ad5580944ea10fd310c1cff
font_01_sfnt_off0000c520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC520 15180 bytes
SHA-256: 51a9a593bcea7d0027201651df27e7d82a80d88fcf7a45cf0a1b9f30c09db930
font_02_sfnt_off0000eaee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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