Malicious PDF — malware analysis report

Static analysis result for SHA-256 efb089648a486f96…

MALICIOUS

PDF

72.1 KB Created: 2021-09-09 21:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6a093093672d35895fffdc6ee4bd529d SHA-1: 9855fcf062aa3ce203bcca05a664e121b0fe2440 SHA-256: efb089648a486f9627b6de590259484d4a66526cea88d81c2e6818c757af5035
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier flagged it with high confidence. It contains numerous embedded URLs pointing to external sites, many of which are structured as link farms. The PDF's structure and the presence of external links suggest it is used to redirect users to malicious content, likely phishing pages or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=top+websites+to+download+tv+series+for+free PDF link annotation
    • https://vinadesigndanang.vn/uploads/image/files/tuxijuliwute.pdfIn PDF document text
    • https://zenmobile.in/jaipriyart/uploads/files/32964397714.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/winezoge.pdfIn PDF document text
    • https://manuscripthandler.com/userfiles/file/92861745628.pdfIn PDF document text
    • http://jobsandhi.com/uploaded_files/userfiles/files/darixerukubemebefufamego.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/jivowukilemasukofew.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/kapikuduwusigop.pdfIn PDF document text
    • http://idcla.net/upload/files/12915168621.pdfIn PDF document text
    • http://alphanaturehk.com/userfiles/file/suduvapi.pdfIn PDF document text
    • https://aporpeter.ro/userfiles/file/16156840037.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/69583294283.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/72818487829.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/52805896441.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6130AFE4A0556.pdfIn PDF document text
    • http://etre-belle.su/images/file/5307651518.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/sotipekazamubalesoruragaj.pdfIn PDF document text
    • http://naturenhuman.com/app/webroot/userfiles/file/tebogitabefidujigudut.pdfIn PDF document text
    • https://e-uchebnici.com/img/file/64710694979.pdfIn PDF document text
    • http://gonganmi.com/userfiles/file/99400887924.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/doxevivizoripidulem.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/74776690341.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f04b2bb52---munakunaxizo.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/32760585507.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_off0000b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E0 15968 bytes
SHA-256: 4054df9e88161522a8bf8df38aa0e9ca8248efc3bdb07483f3d10c89f15a3c29
font_01_sfnt_off0000e1c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C6 10748 bytes
SHA-256: df2fa4364c7a3c7a05ce0fd6dd0c386c6450357a521cceb09d4062ab11f2a200
font_02_sfnt_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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