Malicious PDF — malware analysis report

Static analysis result for SHA-256 7852d8ada2f0e2d1…

MALICIOUS

PDF

75.6 KB Created: 2021-09-11 21:34:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d98e4537fa188d96372cb1bf0f7dfac2 SHA-1: cd63aaaa80c92d9e3683460e783207431a7e1088 SHA-256: 7852d8ada2f0e2d167b5778d1a39919595555c4e4cc89fef80523b6e7c8067ee
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF contains numerous links to disposable hosting, suggesting a phishing or malware distribution attempt. The embedded URLs, despite some being marked benign, point towards a pattern of redirecting users to potentially malicious sites, likely to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/12e5ef18d0aa46af0d164b43287d78ff/minaduja.pdf In PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/pulajitepokiwuwerapoleno.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/zojos.pdfIn PDF document text
    • http://borik.customreal.sk/data/files/67919277994.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/55776068370.pdfIn PDF document text
    • http://mojahotels.com/ckfinder/userfiles/files/xiret.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/mefotez.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/feropoxosoretesu.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/xadivanekobeza.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/sanevebidi.pdfIn PDF document text
    • https://inprovituruguay.com/ckfinder/userfiles/files/gowefum.pdfIn PDF document text
    • http://bippex.com/filespath/files/20210911092424.pdfIn PDF document text
    • http://veszpremlizards.hu/_user/file/32522489110.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/8672207272.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/13538229506.pdfIn PDF document text
    • http://pinxedien.net/upload/files/fabilijuguve.pdfIn PDF document text
    • https://promtour-rural.ro/userfiles/file/64231880641.pdfIn PDF document text
    • http://clair-environnement.eu/catalogue_dynamique/file/xasudupapapanujowuxiteta.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/xekobomabojafida.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/60490702453.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/jutolusirokutigumazevap.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/fevedawigujajuserorugi.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/gaxaridezonosotajozotarog.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/digatuvuka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=physics+textbook+answers+pdfPDF 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_off0000c22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC22E 11204 bytes
SHA-256: 849d3c59b37e027310b942075faf2842a986e824461d73b02843109dfa0c03ad
font_01_sfnt_off0000dc4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f45e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45E 17300 bytes
SHA-256: c7b68d517b1c4d3882ece62f30d02a46a3688335f040a72959bdafa319520514