Malicious PDF — malware analysis report

Static analysis result for SHA-256 8290d68eaf7259af…

MALICIOUS

PDF

71.8 KB Created: 2021-09-19 19:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5275e982aae67089c099490491558ea1 SHA-1: 31c3dbd0238f78f0dd795b0e9c3aeadb818d581a SHA-256: 8290d68eaf7259af8c8ea7f3ae37ea4a57deaf25584a71fdf5fc01097af7e911
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to disposable domains and are likely part of a link farm designed to distribute malicious content. The ML classifier strongly indicated maliciousness, and the heuristic for a link farm further supports this. No scripts were extracted, but the structure suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://hig-hegmann.de/userfiles/file/zixuxukon.pdf In PDF document text
    • http://dissanna.com/temp/fckeditor/file/pijowo.pdfIn PDF document text
    • https://theatresaucinema.fr/uploads/file/12152517460.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/22829088499.pdfIn PDF document text
    • http://jts-electrical.co.uk/ckfinder/userfiles/files/34458522538.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/42296322047.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/lafamozurizum.pdfIn PDF document text
    • https://www.chablis-gautherin.com/ckfinder/userfiles/files/43684716537.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613574661a62f---pawefezilidi.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/wudufudabel.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/wukukop.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/17923579813.pdfIn PDF document text
    • http://heibldr.hu/FCKfeltoltott/file/39646299265.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/lamoj.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/11586289264.pdfIn PDF document text
    • http://yuha.be/_files/file/56231383479.pdfIn PDF document text
    • https://gkia.org/kingkong/userfiles/files/9521494159.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/xenixofepapoxulo.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/jovufutijif.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/majemivilumu.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/vovivipugufe.pdfIn PDF document text
    • http://nbnjl.com/userfiles/files/savafaredas.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/rixopogasukeweverovuxav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=150+shades+of+play+pdfPDF 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_off0000b8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0DE 10524 bytes
SHA-256: a40e7eddfc1c5ca7ce416ec20e7f852ca55679984b298d55bfe3486cc78d4782
font_02_sfnt_off0000e909.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 15796 bytes
SHA-256: 0a30fc31747a80fc00d72af4907eb68d13fd0f557652ade7ebab387486dc610b

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