Malicious PDF — malware analysis report

Static analysis result for SHA-256 9feff353d165d691…

MALICIOUS

PDF

82.2 KB Created: 2021-09-12 22:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 89ffaef3be4cd6f489572c8957aa9afd SHA-1: f8eda000f50f890db83b6cc81cf55a4c03c05586 SHA-256: 9feff353d165d69145b2e52ab2b1b2ada1816fd404ac36c8a9f93930e3ae4ab0
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 external URLs pointing to potentially malicious content. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 5

  • 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.
  • 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://pristineleather.com/userfiles/file/letokazapobojoxavebul.pdf In PDF document text
    • https://mabuksusu2.com/contents/files/96142445730.pdfIn PDF document text
    • http://kayapalinakliyat.com/file/12416918089.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/pidapus.pdfIn PDF document text
    • http://ansing.nl/userfiles/file/76152593668.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/vefusebasadubikobupawoja.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109070417313530.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/kupiduwa.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/61142049031.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/38803891795.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/53101247190.pdfIn PDF document text
    • http://youandisagenix.com/ckfinder/userfiles/files/51863903287.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133296b77bd3---jatafewejogowogajemadeso.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/05/tesilupimuwor.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/20173474687.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/zotujemetudepoz.pdfIn PDF document text
    • http://spbmedaks.ru/sites/default/files/uploads/25321629031.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/durizojajejasurarurizal.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/3ba667068b884cf5742168d6b89935ef/33749761309.pdfIn PDF document text
    • http://sapaelitehotel.com/webroot/img/files/79676398708.pdfIn PDF document text
    • http://vititanon.com/user_img/files/sipamivibojif.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/59179689008.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/28370852434.pdfIn PDF document text
    • https://best-label.com/upload/files/69081831258.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/mimofexakekovamujudaruban.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=get+filelinked+for+androidPDF 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_off0000de7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7C 17736 bytes
SHA-256: e7f1230890b88e3b49a0e82a330456eb9f9825e81277292df3305703d7bb138a
font_01_sfnt_off00010c2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2F 10312 bytes
SHA-256: 5a14fe65c29e73110995ec6614ee89f11f87137714e2b01627e8586429bbe1d5
font_02_sfnt_off00012384.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12384 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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