Malicious PDF — malware analysis report

Static analysis result for SHA-256 f56f8fe39206bf9f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-11 17:04:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7b9b772ddeb51b32f94f77bbcb2dc279 SHA-1: 91ef99e20d0222544f14553b1f885b430b892e9d SHA-256: f56f8fe39206bf9f08b01a0863d07957784dae2e0e858e0ebe02df89f4b7e7e8
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing attack, specifically a payment redirection lure, as indicated by the 'SE_PAYMENT_REDIRECT_LURE' heuristic. The presence of embedded JavaScript and numerous external URIs, many pointing to potentially malicious or disposable domains, further supports this assessment. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise pattern
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resttour.com/images/userfiles/files/35336500246.pdf In PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51179027446.pdfIn PDF document text
    • http://qianxi.cn/filespath/files/20210910235639.pdfIn PDF document text
    • http://www.agot.pl/upload/file/faxujepogoxevejafeson.pdfIn PDF document text
    • http://firegallery.ru/img/upload/53649937817.pdfIn PDF document text
    • http://lionsmarsala.it/userfiles/files/20856846634.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/90428133163.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/88642917790.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/tajotowizidud.pdfIn PDF document text
    • http://codienlanhtrangia.com/Images_upload/files/87540125421.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/6070000237.pdfIn PDF document text
    • http://noithatlekhanh.com/Images_upload/files/53434586811.pdfIn PDF document text
    • http://zygzak.eu/foto_dane/wysiwyg/File/gufuzirudeluje.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/fetosuzorufa.pdfIn PDF document text
    • https://concurs-euclid.ro/upload/fck/44017617812.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/nukaradefesibifu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613076ddcb6b4---jokezobupoberoma.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/d54b7e10f2102815b10df423fcb89600/wojorinowanak.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/24693296572.pdfIn PDF document text
    • https://strings97.hu/userfiles/file/90856796424.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/wuketemosu.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/97558890855.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/99022985042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+ordner+desktopPDF 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_off0000dfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCB 18136 bytes
SHA-256: d2111cf07a176714bb19955423c1e55df423db1b36ad0e718a4a7d26eb117628
font_01_sfnt_off00010e37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001264e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1264E 10248 bytes
SHA-256: 6a0cc1315210eb06a5a315208428e5f9ecbfc57060f2de4161eb9e72d18cd27f

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