Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f034b40235f0356…

MALICIOUS

PDF

86.0 KB Created: 2021-09-17 15:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71196d0259a7ee91041d1d6e8644fd48 SHA-1: babd9460d5f4347f7f6ca34237333e21235a333f SHA-256: 5f034b40235f0356939b0e66a5533d2824b864b64b72d0d4d07587ffcbc103d1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a phishing/malicious PDF by ClamAV and an ML classifier. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The presence of these links and the overall structure strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://3gr-group-com.gbintl.com/ci/userfiles/files/72322693976.pdf In PDF document text
    • http://ambvetesopo.eu/userfiles/files/jitodidovofimivonasomegod.pdfIn PDF document text
    • http://mama-care.com/UserFiles/file/boxolegerebagesuxunitado.pdfIn PDF document text
    • https://debo-fit.be/userfiles/file///52866887635.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/sivufalimegi.pdfIn PDF document text
    • https://beautydent.hu/editor_up/66812680974.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/fujiriwotujugijuxego.pdfIn PDF document text
    • https://whatproperty.ng/ckfinder/userfiles/files/60355706136.pdfIn PDF document text
    • http://kemmurad.com/webroot/img/files/46179536564.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/zajigume.pdfIn PDF document text
    • http://citranco.com/users/files/bebop.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/93228097193.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/jomesosuga.pdfIn PDF document text
    • http://spharma.ua/files/file/kesemodovebitamisaz.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613169978b3b0---43493501477.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/wexojamevivenarupoj.pdfIn PDF document text
    • http://khiensa.com/UserFiles/File/63324845264.pdfIn PDF document text
    • http://www.rify.us/cms-uploads/files/walifosunip.pdfIn PDF document text
    • https://cordovajewelry.com/images/file/vinaraj.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/merisemavarakesur.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614408ca91622---gatajajodilujoweze.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/jexenosakagu.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/kinanizelaninufovawu.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210914123712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=android+app+review+examplePDF 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_off0000ee5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5C 17180 bytes
SHA-256: d96d62d8fe1a11a9e4112e01ea0aec375e06941fb23f401c546757ffed700253
font_01_sfnt_off00011aac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AAC 10524 bytes
SHA-256: 988e0a0ca41dbcae7b33d81978cae57f71ea1d631257a6dbdb906826abf550dd
font_02_sfnt_off00013296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1