Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2df3f261a1fdb3c…

MALICIOUS

PDF

81.1 KB Created: 2021-09-13 08:20:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5c3b5a14f50747383ba40f563381d405 SHA-1: 649a605f4b438ab213766de7d59ffc5fb544a99d SHA-256: f2df3f261a1fdb3c4ed5299998f040fc3fff9972de6aa3a6d92b66961359406c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://thenext.pk/userfiles/files/43635057352.pdf In PDF document text
    • http://biplano.eu/userfiles/files/22602092086.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/tubufabumeteti.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a30fda6630---48678573398.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/febowavo.pdfIn PDF document text
    • http://clingac.es/d/files/bisizewufajoz.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/82341852650.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-3/20210903041008510331.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/vopomisamubobax.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/juwivejipupav.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/sapasowifomeb.pdfIn PDF document text
    • http://curvesncontours.com/userfiles/file/jegidijifutuvukaze.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161320ff9b5b95---93480186567.pdfIn PDF document text
    • http://lidaoxc.com/upload/files/32841269865.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/worosos.pdfIn PDF document text
    • http://thongthien.vn/upload/files/8730369242.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/98959493954.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/gokegukuxufenuk.pdfIn PDF document text
    • https://kubermatkaplay.com/ckfinder/userfiles/files/wevikuz.pdfIn PDF document text
    • http://costruzionibulagna.it/userfiles/files/50718524132.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/42174153830.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/9701864482.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/55782610840.pdfIn PDF document text
    • http://caydinhlang.net/userfiles/image/file/99756824306.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/42490604483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=media+creation+tool+windows+10+64+bit+downloadPDF 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_off0000d6f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F8 17968 bytes
SHA-256: bfc5fe99a763c72cefc8dbe7ca1b5e0385cffbc10b2f07e04be02b45c3f84df8
font_01_sfnt_off000104e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E5 11004 bytes
SHA-256: b37db8436331090bef3fc58b0a6057ff1c3764a9cbb24590e70c5ee916d6e157
font_02_sfnt_off00011eba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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