Malicious PDF — malware analysis report

Static analysis result for SHA-256 c286711c4a4a057e…

MALICIOUS

PDF

71.8 KB Created: 2021-10-04 01:46:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 2ea30e95ffce0fd0c01ad043b75f97f6 SHA-1: 8690d2c15f19e97aa600d51a516417198b4c14da SHA-256: c286711c4a4a057ee5d386596e88566cef52fb607ccc0e240fe849dbe2786016
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. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, indicating a likely attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it's designed to facilitate phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://kligi.viart.lt/ckfinder/userfiles/files/48022149424.pdf In PDF document text
    • http://synphabase.ch/upload/file/jojidefefikorubu.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/pijuwivakuja.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8a435579c---nelewaxizosuxumajoxuwumet.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/63905921446.pdfIn PDF document text
    • https://camgloberealtor.com/userfiles/file/54675005660.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/14827670092.pdfIn PDF document text
    • https://kalendarz.probik.pl/fckeditor/userfiles/file/9103269807.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/25155510327.pdfIn PDF document text
    • https://askisan.daynexdemo.tk/upload/files/liberaluwob.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/58184823574.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-18/20210918000928591742.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/dejawixinajuges.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/43484002212.pdfIn PDF document text
    • http://csc-027.com/userfiles/file/20210926162133_41xvgi.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8a07e758f146e6089e6e9b332df27930/nanabakamisebo.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/40583588504.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/84692451111.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/46231592935.pdfIn PDF document text
    • https://hinodecoder.com/userfiles/file/78753024489.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/jebosi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=machine+learning+concepts+cheat+sheetPDF 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_off0000b1a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A1 18256 bytes
SHA-256: fb198f2c51e073f7baf28015ccc7c3b50371e44d53d1426c60f1049ace32d4fd
font_01_sfnt_off0000e04d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE04D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f864.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF864 10648 bytes
SHA-256: b16caaba57f8e03ed4e5e015c27873a15879c29f6ebdf808eca25eb434fb1605

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