Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9f80338f8a966fc…

MALICIOUS

PDF

83.0 KB Created: 2021-09-15 20:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20795bffc7371282442640436d8eb7e9 SHA-1: 824bfa6da8046ce3b00b56199c63e917c031d0b0 SHA-256: b9f80338f8a966fc61cf060448ee8a6b44aeffa6f654a7da24efa0a58bcb788b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting an attempt to distribute malicious content or phish for information. The presence of a 'download button' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=latest+telugu+movies+watch+online+with+english+subtitles PDF link annotation
    • http://sportsgarten.com/editorData/file/43250407833.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/88826333835.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/wosomexorewipepixalorin.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16133cf0a01cd5---wewanuvaxe.pdfIn PDF document text
    • http://vinacafe-dalat.com/Images_upload/files/35763258948.pdfIn PDF document text
    • http://0225674989.kad.tw/kads/ckfinder/userfiles/files/21233797631.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/wexij.pdfIn PDF document text
    • https://kuepancong.com/contents/files/72950570333.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xanubiviwusefa.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/6615017679.pdfIn PDF document text
    • http://namthangbasaltstone.com/uploads/image/files/59141623478.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6010331867.pdfIn PDF document text
    • http://klpa.net/userData/board/file/xebepegolelutiwiduvabus.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/37145990094.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/19268889786133b18d45aef.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/nipufanul.pdfIn PDF document text
    • https://shop-ecobati.com/medias/upload/files/31350758880.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/42046135342.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/fowugonozikamem.pdfIn PDF document text
    • http://www.rupankar.com/fckimages/file/80704286611.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/52876842166.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/39974018588.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16134161cd4a4f---68689822309.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/fuzere.pdfIn PDF document text
    • 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_off0000df86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF798 17216 bytes
SHA-256: 47e9011a5f4027c00c95d1651d4afc20b5626faefb4a194f490e2b37873707fc
font_02_sfnt_off0001244c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244C 10924 bytes
SHA-256: a77ecc2944f7fa1f5176fe0f5540dca15f4b8a54dd88048821c0ae862d2b9a91