Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef7785e4a2ffdeb…

MALICIOUS

PDF

75.3 KB Created: 2021-09-09 03:58:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c1972085f136ecdf477d62ed2a4634a4 SHA-1: 8f7ee55d48132d150199ffc4b39c9ec5ef8126b3 SHA-256: fef7785e4a2ffdeb83cae6d6ed60c1dc0ab19bd3f6f19f6c5c982e136920be81
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bushregenerators.net/userfiles/files/75039054395.pdf In PDF document text
    • http://haisushitogo.com/uploads/files/kugemifimakigesubez.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/64040302937.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/2789374308.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/38351981632.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/fopejepedadipu.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16136347f6f026---tojizewekaxetopukulezi.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/jagajemajaxotupidit.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135333ed80a6---fejiden.pdfIn PDF document text
    • https://lyubomiradineva.com/files/file/40270936541.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/72519772107.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/xawutuxefufe.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/90525206721.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/nowexu.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/padifapi.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/nunejir.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/95941279922.pdfIn PDF document text
    • http://bakersfield.thepokeluau.com/uploads/files/nofoxomukakeguput.pdfIn PDF document text
    • http://nhatrangpalace.net/app/webroot/upload/files/76945349224.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/48886260548.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/13039020861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=roblox+theme+park+tycoon+2+money+hackPDF 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_off0000c220.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC220 16984 bytes
SHA-256: b3a6ba64d801637c544d2859233771c5042f1047b1ba6794db696d3434eddd53
font_01_sfnt_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10691 10992 bytes
SHA-256: 8dbd72c748bb926c4f15c3d2e82929753e66883c450a03d7f6896030c80a5d59

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