Malicious PDF — malware analysis report

Static analysis result for SHA-256 5df7583a49324e86…

MALICIOUS

PDF

70.7 KB Created: 2021-10-01 11:44:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0873f4d2c6e7cb9aab124791a459964e SHA-1: 58db5fa425258ba2af18c3189c9462c9b51bb069 SHA-256: 5df7583a49324e862cb8e507f8b057df9fad1b8f7d582fc03cebf57a587f9843
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to potentially compromised or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to redirect users to malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://rent2day.ca/ci2/userfiles/files/10443539196.pdf In PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/motubonulotaremiwawofoso.pdfIn PDF document text
    • http://wwstationery.com/files/file/fezegofijevutoz.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-19/20210919085445865475.pdfIn PDF document text
    • https://mami-m.com/Uploads/userfiles/files/xusovizizisafapiwaxanur.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/pufetititikefi.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/96191226022.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/81068746520.pdfIn PDF document text
    • http://altus.pl/userfiles/file/wazamagewidibagal.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/28590457934.pdfIn PDF document text
    • http://esteticka-stomatologie.cz/files/content/file/60123652631.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/63683212412.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/sigafiderutakukok.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/tikoxofogosiziruna.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/fitowowipibafakot.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210905_37B6C2A09F48DEA2.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/6352015262.pdfIn PDF document text
    • http://presssimayeshahr.ir/pic/file/noxasefa.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/60637797506.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/161565e6baefc5---4292149566.pdfIn PDF document text
    • http://salkim.com/userfiles/file/tepite.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/74781661816.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/161538fd156a7c---dunimi.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/77727627546.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=a+mango+shaped+space+pdfPDF 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_off0000b1a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A6 10712 bytes
SHA-256: 80daf03e65637f785f6fcfdbcf2dbb5cb1dcaf645b29316203d61dc5ade7a7aa
font_01_sfnt_off0000c9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 17120 bytes
SHA-256: f7aec0aab4854b4fd1d6871f849b0e87e65ef9fae50f7a326c6e5cf8a6dc5f4e

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