Malicious PDF — malware analysis report

Static analysis result for SHA-256 43f05e71895961f3…

MALICIOUS

PDF

72.8 KB Created: 2021-09-19 22:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: af8ebeb3030efec3edbd17ad4dedc427 SHA-1: e15ad09fd0a3bdf20a49e187c86f3f5efc3cda27 SHA-256: 43f05e71895961f34a352aae4204f396db686a7965150ffcc0ec3d229e5933fd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by an ML classifier. It contains a large number of embedded URIs, many of which are part of a link farm hosted on disposable domains, suggesting a malicious intent to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the presence of numerous external links points towards a phishing or content distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dlastudenta.org/Upload/file/49546257645.pdf In PDF document text
    • http://alhegazgroup.com/userfiles/file/90064946499.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef35a66482---24897854540.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109170007015574.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/25208355910.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/kufaxiguda.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/53322894877.pdfIn PDF document text
    • https://karapinler.com/calisma2/files/uploads/xirosifo.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/lolenibubusev.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/33950807623.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/batuf.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/nexidu.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/xipam.pdfIn PDF document text
    • https://raovat72.vn/uploads/news_file/wetutudemezezafagov.pdfIn PDF document text
    • http://gd-weimi.com/upfolder/e/files/20210909033436.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/9634547627.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/magozo.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/mises.pdfIn PDF document text
    • https://dcmheavyequipment.com/admin/images/file/todavimegibodapugulebi.pdfIn PDF document text
    • http://state-lithium.com/upload/files/8429143604.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/24055375068.pdfIn PDF document text
    • https://alev.az/userfiles/file/zobivizupafupuwitutisar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=free+online+hollywood+movies+sitesPDF 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_off0000bb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB92 10592 bytes
SHA-256: 7de442468063379a577e894d2f3c35ef1a3a2acf0f2077536babcc4524d2abe3
font_01_sfnt_off0000d394.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD394 16544 bytes
SHA-256: 4bc14c11162b583d4f8bdfecff4d426738a8f0fa3f7ca93ca5451faeb8bf721b
font_02_sfnt_off0000fd62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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