Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebaaeb17b174630…

MALICIOUS

PDF

71.3 KB Created: 2021-09-12 17:02:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4d841820e1c16a969bfdb650d02daf21 SHA-1: 13636faeae90c2d002150c5244547c4e88e4ff7d SHA-256: aebaaeb17b1746301f5adb56c2a0409c02d12b4bc05a09ac66b3a244ca23ed59
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. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to potentially malicious or disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to obscure the true destination by using many distinct hosts and UTM parameters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274ca8a84e---doluraviwegi.pdf In PDF document text
    • http://mikomisushiwc.com/uploads/files/35843204884.pdfIn PDF document text
    • http://tuyothuyluc.vn/webroot/img/files/13376450727.pdfIn PDF document text
    • https://ismart99.net/upload/files/99555006586.pdfIn PDF document text
    • https://batdongsandothanh.vn/luutru/files/kerosevupekulunabemapupux.pdfIn PDF document text
    • http://wernitznigg.at/files/fotoluj.pdfIn PDF document text
    • http://samtekelektrik.com/files/70305524375.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/67346099968.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/67058207342.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/lekazidatabawolafilovaruf.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/fabiretagivus.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/xixunovegelugolabimuxi.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/nikopazolo.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/raxodori.pdfIn PDF document text
    • http://zeshengtecphar.com/UploadFiles/FCKeditor/20210906205947.pdfIn PDF document text
    • http://synowka.pl/galeria/file/fiveju.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/85683559680.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210911181714.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/timolesujosivofupavure.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/20504534243.pdfIn PDF document text
    • http://abnicum.ru/files/file/jerukudajawuruluxumoki.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/41121805314.pdfIn PDF document text
    • http://retailcop.ca/files/5189355487.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/gekapemobad.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/33180238573.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=world+truck+mod+apkPDF 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_off0000b669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB669 10364 bytes
SHA-256: 08c9b6f529790d3b486327940a3d2ad85b3bcb935e2986279da29eac77ab64d1
font_01_sfnt_off0000cde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE2 16496 bytes
SHA-256: 56d6c5f71d8d0992fc3a75aeac85b7f1a038e1f353c71a4c7d5a9231f60d3c5b
font_02_sfnt_off0000f80b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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