Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb26174234aaec98…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 14:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3d498a3f587f38093d67d26e50b6ad7 SHA-1: 3fad04f93656519eb633e7ac40373395cf554c7a SHA-256: bb26174234aaec98f7a5cfa8e3b8332e5e80b6f6dda746a26d4f18d058b2f60a
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the structure suggests it's designed to redirect users to potentially harmful content or facilitate further exploitation. No scripts were extracted, but the sheer volume of suspicious URLs points to a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://krisoc.ru/uplcv?utm_term=ludo+movie+torrent
    • http://nenayu.com/filespath/files/20210914063624.pdf
    • http://lauraestetica.com/userfiles/files/16924034239.pdf
    • http://beautifulmoda.com/userfiles/files/vapimufidewusiwujururu.pdf
    • http://spad.kr/userData/ebizro_board/file/84019784485.pdf
    • http://trip-sale.ru/userfiles/file/guxonazewovuforubikoz.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/161379c6338933---68526878269.pdf
    • http://ark-mr.com/data/home/qxu2063190031/htdocs/uploadfile/files/dusabunesupafelisam.pdf
    • http://miryangpension.com/FileData/ckfinder/files/20210905_098E64FEEC1212CF.pdf
    • http://llux.vn/uploads/files/66684069977.pdf
    • http://yanarfabrics.com/firma/files/64565006496.pdf
    • http://lixupeng.com/uploads/files/ziviko.pdf
    • http://bienenaktuell.com/sites/bienenaktuell.com/files/file/godekolojegopates.pdf
    • https://pfollowers.com/ci/userfiles/files/73937535154.pdf
    • http://gadkowski.pl/repository/filemanager/file/77658839976.pdf
    • http://vlajkylevne.cz/UserFiles/File/58939409943.pdf
    • https://norservis.info/files/files/pefimutufebitupi.pdf
    • https://braveathlete.net/geektic/files/32473184227.pdf
    • https://rpdev.org/ckfinder/userfiles/files/kuwopap.pdf
    • http://shoreluxurylimos.com/userfiles/files/voxitomibivov.pdf
    • https://signika.pl/Upload/file/92229613881.pdf
    • http://marketypik.pl/zdjecia/fck/file/wobuxutak.pdf
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/wezijalifemigotepave.pdf
    • http://sokole-tps.pl/userfiles/file/24587512519.pdf
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dejobaboxuzeseki.pdf
    • 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_off0000ec28.bin
abeed98803acb9a7341c7d100b126bcae7153a8d6907112896ea2eab942201dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC28 18504 bytes
font_01_sfnt_off00011c59.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C59 16792 bytes
font_02_sfnt_off00013470.bin
a871657424d393108ed68224a2c5eff22697cd26ec801f9b817e6ce7ab3d38d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13470 10156 bytes

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