Malicious PDF — malware analysis report

Static analysis result for SHA-256 10c696467aa63aa8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-12 21:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9029bb4a272c65d498733c3391d8b892 SHA-1: 45d79b1a506575454d577c175859b7929cfdb9ad SHA-256: 10c696467aa63aa8b22966895328b756508840920e67ba59beb09c78b8781486
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. While no scripts were extracted, the PDF structure and the ML classifier strongly suggest malicious intent, likely to redirect users to potentially harmful sites. The presence of many distinct domains and UTM parameters points towards a campaign aimed at traffic generation or SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 4

  • 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 http://uklearningnetwork.com/userfiles/file/roredo.pdf
    • http://dpnovelty.com/upload/files/garipumoxa.pdf
    • http://shangrilayunnan.com/ckfinder/userfiles/files/99016239898.pdf
    • http://textstricker.de/benutzerdateien/45886848025.pdf
    • http://csa.china-led.net/static/editor/ckeditor/ckfinder/upfile/files/16278270461.pdf
    • http://wahluenfty.com/userfiles/wunilur.pdf
    • https://mmtours.si/uploads/kimakujejokuz.pdf
    • http://spad.kr/userData/ebizro_board/file/45135334002.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/84132628706.pdf
    • http://df-2.de/images/daten/file/gazubom.pdf
    • http://dulwichtaxi.com/survey/userfiles/files/91100342815.pdf
    • https://sydneystudytour.com/accounting/userfiles/file/94823808261.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/61643598861.pdf
    • http://crosswaysrecruitment.com/userfiles/file/ratopanijodof.pdf
    • https://transmar.biz/ckfinder/userfiles/files/wigovuwozavonukurub.pdf
    • http://nikolabartakova.cz/files/file/jofotifitiril.pdf
    • https://aljuboori.com/userfiles/files/13215680070.pdf
    • http://www.og2c.com/images/file/tukugasarikogoxedupazib.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161379ec631d5f---92119291249.pdf
    • http://ccadl.com/files/20210904200439.pdf
    • https://argentinaproduct.com/ckfinder/userfiles/files/xuvilizilima.pdf
    • https://alsultantrading.ae/userfiles/files/87943903376.pdf
    • https://imaggu.com/ci/userfiles/files/kovesutomabu.pdf
    • http://jar-ted.pl/file/zipurexatosoduwa.pdf
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/f5a8f3a7f9faae758398ab4f2a97e072/kuwede.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=delete+pdf+pages+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9c1.bin
86827f9adb4f558b5d980316d89726260ceb098410d2df67a866d74384856131		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C1 17980 bytes
font_01_sfnt_off000107f2.bin
4b1c7acba2256a27eee820181ddd59c89b69b697d705f39637c6c929dfd9150e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107F2 10676 bytes
font_02_sfnt_off00012055.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12055 16792 bytes

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