Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a82d4b27eb20e63…

MALICIOUS

PDF

80.5 KB Created: 2021-09-11 15:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 55c0af3e3abcbf05ad710424f94701ea SHA-1: 5c628182bee13086ddd663ea1c30005ca3af3614 SHA-256: 7a82d4b27eb20e634f6b55d65b2f01e8342da49f9a19803759dbce0bee05fb10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by multiple engines, including ClamAV and an ML classifier. It contains numerous external URIs, suggesting it functions as a link farm or a lure to external malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://icbacademy.com/upload/files/34397439039.pdf In PDF document text
    • http://locthanhroyal.com/upload/files/32800846315.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/zupamujapotajominokowuti.pdfIn PDF document text
    • https://piti.leaddeehub.com/userfiles/files/67040723461.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/28401805426.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/xujivigevawekut.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/15884745545.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/relatezasejexateda.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/80649795528.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/ajm3p525q5hd9l9mgb3v3lmcp2/33170309402.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/kakataru.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/kipibarar.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/merajunirumoxizim.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/95781908272.pdfIn PDF document text
    • https://nedimgame.com/calisma2/files/uploads/meludatapojolidifalep.pdfIn PDF document text
    • http://brickform.cz/obrazky/files/gixujunabesuleb.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/bubatitafubidadudejos.pdfIn PDF document text
    • http://cartopack.be/Images/file/69921057751.pdfIn PDF document text
    • http://bbbo.handyfriendship.com/upload/files/lexebobifazejojodazelut.pdfIn PDF document text
    • https://sharmtocairo.com/userfiles/files/78390218845.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zimeja.pdfIn PDF document text
    • http://veszpremkosar.hu/_user/file/tewepikivinu.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c643947844---nopeguroxalexipalukozobu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+mod+gratis+para+androidPDF 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_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 10908 bytes
SHA-256: 7e8c212f232bc15b8f73ae0aee6c38fd9fa0bac71a6fb1d74a4297a5dfd500ff
font_01_sfnt_off0000ecc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D6 18332 bytes
SHA-256: e680187fbd5fb9a428a1e952c511fb4290700788d5a76736c5891d074449866d

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