Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d22ecb313aef550…

MALICIOUS

PDF

72.7 KB Created: 2021-09-17 08:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 73d6481ada9a18e84d50a0dd61bbca6f SHA-1: bd981c2cc08203721e6087238c05b6690f263467 SHA-256: 6d22ecb313aef5509ca7c912b04d11a15ca23d1ae6f2d67c1e791376d164df87
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=are+iphones+really+better+than+android PDF link annotation
    • https://gemwares.com/userfiles/file/gotenokiropazotejemawu.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908195859_j8i8tp.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/fivukimotutafop.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/vuzik.pdfIn PDF document text
    • http://ciskmv.com/css/file/97392214155.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/rigeposugiwidotolawog.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fapaviz.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/68775880508.pdfIn PDF document text
    • http://ntvietnga.com/upload/files/kuralajib.pdfIn PDF document text
    • https://letajicikoberce.cz/userfiles/file/39929381104.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/lemal.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/xupazesid.pdfIn PDF document text
    • http://pro-customer.de/userfiles/file/xeradezixosajig.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/1485698153.pdfIn PDF document text
    • http://lhdrum.com/User_File/UpFile/file/20210906033724_MTY3MDU5MTE2NjI=.pdfIn PDF document text
    • http://jvcc.cn/ckfinder/userfiles/files/210911105643273555mhmdx.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/rilekovogulapaxibi.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/bakuvobagemumefebavuwene.pdfIn PDF document text
    • http://kidneytracker.com/ckfinder/userfiles/files/61694743496.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///48961856748.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/46698049039.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/nijinadidug.pdfIn PDF document text
    • http://novo-foto.ru/ckfinder/userfiles/files/35804856879.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/jufigurafibifosuku.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/83702205583.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_off0000b9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FE 10724 bytes
SHA-256: 46d19c8ae41622bd46a30fe61f40409d240d41c833b2608bd8f4a33fb9cea662
font_01_sfnt_off0000d25c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD25C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ea6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6E 16332 bytes
SHA-256: b3faa61ef4e6cbb710a811248b75839920392f5b2033232aba1f8f367c2783e1

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