Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff125565a3b67864…

MALICIOUS

PDF

83.9 KB Created: 2021-09-23 15:37:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7ac08efc9561e5d40ec777d7cb95b61d SHA-1: 945fdc4088941d98aea4521ff602f5872a9d4a51 SHA-256: ff125565a3b67864b82419b8d92a44edd60395b17e545781e9c3b80cb3f8fcb0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to PDF files hosted on potentially disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b665e54a93---47852855774.pdf In PDF document text
    • http://garmaclima.com/uploads/ckfinder/files/20421818828.pdfIn PDF document text
    • http://uleshuzatshop.hu/files/file/65853383797.pdfIn PDF document text
    • https://mangallagn.com/images/file/58102506785.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/xenokogedawi.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/nibomidax.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/nubabex.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaeeab2ae4---refafeberakibelapevi.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1206273443613518cfc9bd8.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/29325866754.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/96307590637.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/47248591919.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/mumuxaworapobok.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/bagaf.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/fipow.pdfIn PDF document text
    • https://matao.ro/app/webroot/files/userfiles/files/xuligexumi.pdfIn PDF document text
    • http://hoteldarim.ir/basefile/hoteldarimir/files/bojopekulolivesuxi.pdfIn PDF document text
    • https://ijieet.org/ckfinder/userfiles/files/perizul.pdfIn PDF document text
    • http://mrspk.com/ckfinder/userfiles/files/fogozuliruwo.pdfIn PDF document text
    • http://01host.ru/userfiles/files/90802506166.pdfIn PDF document text
    • http://wksystems.net/HotelEstimator/userfiles/file/ferepusadepide.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/47714332689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=p2p+apps+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_off0000e426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE426 18056 bytes
SHA-256: 3da7fbe6a6544d7e6915c37a5eb5da9fa8a8c9cbef9654e4e9329a5e00374c37
font_01_sfnt_off0001130f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130F 10336 bytes
SHA-256: d862e4018c20690344ae8bd782560974636f4af2cee001f50106b5df0b94fd0a
font_02_sfnt_off00012a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A83 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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