Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef400e07d6c5419…

MALICIOUS

PDF

77.0 KB Created: 2021-09-28 16:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 62356abeea90348f0888914e23bc7668 SHA-1: 759cbba2fa4ac7848718eeac6a82d6010cabaa25 SHA-256: 2ef400e07d6c541968a6413b45c8aa2eae290a5f798e5334a980b6c8f6ecb3a5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://delannahotel.com/user_img/file/xudufegovibuvidufadaguro.pdf In PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/50789012131.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/boxamigidajojogaket.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/66783468480.pdfIn PDF document text
    • http://trieuduong.com/images/Download/zevuxawozagimudokir.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/jipuvavoven.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/pijanizosof.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/kosalowiligokotupudapene.pdfIn PDF document text
    • http://weingut-suppan.at/files/legazolewumat.pdfIn PDF document text
    • http://balalajka.nu/media/vufuxediwekir.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/legomisurosol.pdfIn PDF document text
    • http://fazendasaojudastadeu.net/fotosempresa/files/24947117338.pdfIn PDF document text
    • http://checopharma.com/upload/files/riluli.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/90566358299.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/29539442329.pdfIn PDF document text
    • http://xn--h1agcmh.com/ckfinder/userfiles/files/luxutifexomupurulidat.pdfIn PDF document text
    • http://e-photo.lv/ckfinder/userfiles/files/jilamizezizowimuteberunu.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zijomixagetegugu.pdfIn PDF document text
    • https://codefon2.solar-napkollektor.hu/js/ckfinder/userfiles/files/50208376303.pdfIn PDF document text
    • http://cartopack.be/Images/file/riguzidatoguzi.pdfIn PDF document text
    • https://ustunbilgisayar.com/userfiles/files/likogonekudixev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=andro+zen+pro+z2PDF 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_off0000c1d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D5 9980 bytes
SHA-256: 25805e33bdfde0a576ade5d71a2d419886c4fa9e797d300047d56dafd5ee11c2
font_01_sfnt_off0000d813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD813 21072 bytes
SHA-256: eacf9c31939e7ebdfea28c1fbec64449937138c9039672de73603841e186b7cd
font_02_sfnt_off00010ebc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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