Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3341068e742bb54…

MALICIOUS

PDF

93.5 KB Created: 2021-10-04 12:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 3a33eaccdc021bfc1cad26b1453c5a9a SHA-1: d4cb02eefd2245c4a6d6a276a5820e0da1b6753a SHA-256: e3341068e742bb54e1959c1f7404f686e0abcf4c467923223dd9c7787d46cffd
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the structure and URL patterns suggest an attempt to direct users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://imreelectric.sk/uploads/file/kajefiliwifusoguxubaboj.pdf In PDF document text
    • http://haiqi-machine.com/d/files/9446481882.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/67724168254.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/rofanosog.pdfIn PDF document text
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210901023525.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f947a8844e67a93dac2f49f9f16609e5/dowipebib.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/56479641220.pdfIn PDF document text
    • https://pellevah.com/upload/files/pixigiduvifugudeg.pdfIn PDF document text
    • http://viorina-deko.com/images/file/zabetapa.pdfIn PDF document text
    • https://onecre.com/images/content/files/61362805247.pdfIn PDF document text
    • https://igraonica.me/userfiles/file/muxabodomif.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/suvetirezatoze.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/modaxigedo.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/39796707165.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210925214440.pdfIn PDF document text
    • http://jamones-luna.shopcloud.es/ckfinder/userfiles/files/13406399137.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140a47be4a2a---zanidox.pdfIn PDF document text
    • http://ventmetal.ru/userfiles/files/15780993693.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/886035372.pdfIn PDF document text
    • https://tivicom.vn/upload/files/34697676424.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/63304175476.pdfIn PDF document text
    • https://malabarmail.com/ckfinder/userfiles/files/54200450515.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=volvo+s60+immobilizer+see+manualPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF65 1888 bytes
SHA-256: 228445a3744f13af4bf84041e55802a923554d86926eb0745489ea117e4ab105
font_01_sfnt_off0000d829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD829 16672 bytes
SHA-256: f6f7255e5871e5f4c2cd3b1d89ffd09017fcbdddf45b3da09463d526710bddcf
font_02_sfnt_off0000efea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEA 27644 bytes
SHA-256: c8be07196826164f83ae0c3178a503a854da55c6eab511f31ecbea62d061a03e
font_03_sfnt_off000134c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134C0 10796 bytes
SHA-256: aadb2ac5feacddb6fe8440c0904496464d7f219827d4e943923cafd630769d6a
font_04_sfnt_off00014da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1