Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dc4d43899bc691…

MALICIOUS

PDF

81.9 KB Created: 2021-09-13 09:24:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 67552f1d3ddf2e34f22b5d26b17d0818 SHA-1: 954a94e04b28f40c71a8ffa82f37c2db52063657 SHA-256: 24dc4d43899bc6915a6acc8c54a2bd22ff6268342aa9dec11a292869a1f36f0e
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs pointing to various domains, many of which are structured to host PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of link farming, suggesting the document's primary purpose is to manipulate search engine results or redirect users to a large collection of potentially malicious or spammy content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://kimura-shihoshoshi.com/userfiles/file/kepamokop.pdf In PDF document text
    • http://tomaszfilipczak.pl/userfiles/file/jafedewapadini.pdfIn PDF document text
    • http://harchovyk.com/userfiles/file/gamiluzomawowa.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/13756290374.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81745700929.pdfIn PDF document text
    • http://nuk-amro.de/userfiles/file/58836703237.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/69557232222.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/26353748207.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/13505706439.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/wemokurajoboxeg.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/98221764386.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/84321653313.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/2584121081.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/86348604748.pdfIn PDF document text
    • http://ebara.com.hk/ckfinder/Zenith/userfiles/files/wugodigero.pdfIn PDF document text
    • http://crimesla.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givabotimelifibijujuko.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0910/c68c8169524a74f5b2c1de9fba4c2672.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/faragezalul.pdfIn PDF document text
    • http://webbyshoe.com/fckeditor/userfiles/file/64384188258.pdfIn PDF document text
    • https://protum.se/file/87980498407.pdfIn PDF document text
    • https://barcelonacentromedico.es/files/galeria/files/25350857735.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/wimulabixebiw.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xukatumagunugaf.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/16458710830.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=real+steel+world+robot+boxing+cheatPDF 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_off0000dace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f2e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E0 17632 bytes
SHA-256: 4709e728823f7d28d795244db8b8e99ab864f72b9d106bd8df6b260cd63da38f
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 11020 bytes
SHA-256: 5fde0f43be482710d2ecbfab61d7189b596b05aeb4bd0e66954019e9a4eaf74b

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