Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ec6adc75c914efb…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 19:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b92cc5f8a24a87cf6a6155cfb5cefbf6 SHA-1: df601d1aeffbd6cce567439d22fa6025e94476a7 SHA-256: 3ec6adc75c914efbf838e0654118255c9fc2d1b682160db749d7df81f38a4aa5
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, including an image-only presentation and a click-outward action to a suspicious URL. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detection confirms its malicious nature. The embedded URLs are likely used to redirect the user to a site that hosts further malicious content or attempts to phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://synerhu.ru/uplcv?utm_term=if+he+loves+you+quotes PDF link annotation
    • http://atomleasing.ru/media/File/91739442566.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/25e18c7a383c1eb7e0b20e2616a497c5/bitejifenagotixor.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210920080932.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/4321035674.pdfIn PDF document text
    • https://orrizon.ru/images/file/tizuxesofu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133d0ae88b49---46616577440.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/51259634774.pdfIn PDF document text
    • http://sun-green.eu/ckfinder/userfiles/files/mesugemasosupo.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/96953963728.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/66847355073.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/vagimen.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/24204959736.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/42424301000.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/27361133759.pdfIn PDF document text
    • http://gradn.ru/uploades/fckeditorfile/86066582776.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/zixavat.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/94633712767.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/tefufisazawej.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/72697107751.pdfIn PDF document text
    • http://skinct.com/upload_file/file/Fl202109061827004749.pdfIn PDF document text
    • http://vekosgroup.ru/userfiles/file/pixosexivefikasuzifa.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/dorutirevavo.pdfIn PDF document text
    • 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_off0000af50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF50 14524 bytes
SHA-256: 3273454b640be66ecd1cbb66c2c775537e98c8c79bf6ba1286cc97caffd9f72c
font_01_sfnt_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 10232 bytes
SHA-256: d730bfb24f9b0d0c8679f15cb0a0f6733b36563db7b1d02a73f79eb4e56ba4ee
font_02_sfnt_off0000ea9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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