Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5a4084680b8302…

MALICIOUS

PDF

68.7 KB Created: 2021-09-24 22:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e85d5358c37f121e8f7ea6b6c9f377ab SHA-1: e891247188669771974853b1caceb40217325f63 SHA-256: ef5a4084680b83027e953dcedc73d4fc607dbc831d0bde9f5b5f66d43401ae77
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, which contains a clickable link directing to an external URL. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous URLs, many on disposable domains, suggests a link farm used to distribute malicious content or facilitate phishing.

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 0 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://irlanc.ru/uplcv?utm_term=how+to+find+the+trash+on+your+phone PDF link annotation
    • http://zsdbiopharm.com/upload/files/82608372907.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/12638592313.pdfIn PDF document text
    • http://artio.pl/files/files/64329254102.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/81510193205.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/88163130484.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/xometopiwiwabaxuxakonedak.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/70039185641.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/ruxaxisupejadijopun.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/manilot.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/jubalojivasezajajajizep.pdfIn PDF document text
    • http://self119.net/upload/userfiles/2021/09/files/210924130141.pdfIn PDF document text
    • http://thaimassageboy.com/ckfinder/userfiles/files/bigekebuforasugoxaxes.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/40183044904.pdfIn PDF document text
    • http://ping-property.com/user_img/files/75346618755.pdfIn PDF document text
    • http://daotaoyduoc.org/wp-content/plugins/super-forms/uploads/php/files/36e899ed3170ee85e133cb3b74c68287/88128992574.pdfIn PDF document text
    • https://eol.org.pe/ckfinder/userfiles/files/ziwevan.pdfIn PDF document text
    • http://yangs-ns.com/ckfinder/userfiles/files/20210908150846.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/dolukuvimodilibureralemum.pdfIn PDF document text
    • https://aspart.ro/ckfinder/userfiles/files/jojixapakiwasavapol.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ea1607bf72---menopesopulozobofi.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/topivekinobiwun.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/36978200069.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_off0000afcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFCC 14524 bytes
SHA-256: f2a81ef28e1596bb6951250172371fdd0721be5d96975c9c411b8d2bbe8a9cb5
font_01_sfnt_off0000d3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 10840 bytes
SHA-256: a6f99164490087bd0f1e02b004a882486ef2d00fa12e139bfc81654247dffb1c

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