Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfc773d510f7f393…

MALICIOUS

PDF

88.0 KB Created: 2021-09-23 13:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7d2180dbcb2f38bf5249911b772e7971 SHA-1: f24138e54f09f57a6caec8eb753657b5492ab587 SHA-256: dfc773d510f7f39371915cfc007faf139d47654255afb89250f1651864b296e2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users, likely for phishing or to serve further malicious content. ClamAV also detected this file as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://obrienbuilders.com/userfiles/file/kuwonorezuvaxazuvefurami.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/58922072734.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/86139824850.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/29610492412.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/66090273644.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/45040440989.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/lekajoxemujaperiwuvab.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/bigetogigefinujotizupopej.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/41436261336.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aceb0e6626---giwamujunav.pdfIn PDF document text
    • http://unityproductions.com/upload/files/xolerusexarogixesaradazur.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/2548479132.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/lozumorodoxonizusoliweg.pdfIn PDF document text
    • https://gberwanda.com/gbe/useruploads/blogs/files/21399048826.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210922160125.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/bafidunibagikesupedonafik.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/10027205843.pdfIn PDF document text
    • https://s-serviss.lv/userfiles/file/kekekafupilusoseduduga.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/sodinik.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/67516271828.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/66424675923.pdfIn PDF document text
    • http://zkpower.net/upload/files/wunowuzikorikovetejudusaz.pdfIn PDF document text
    • https://panoramamall.bg/ckeditor/ckfinder/userfiles/files/13657270599.pdfIn PDF document text
    • http://pluimveebeurs.com/userfiles/file/kogiximosazur.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/pisum.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/zezofiw.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/59427458805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sky+go+for+android+phonesPDF 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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D7 10912 bytes
SHA-256: 64d5f1ba4a422826e9d231ceb63247332ac2527198731b5dc044a8a502dccb61
font_02_sfnt_off000121d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121D3 18520 bytes
SHA-256: f34e1a5dd1f69a12f00863b25ed473891d57628249af8a1c08442ee8131f2210