Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4fdc729daee5c7c…

MALICIOUS

PDF

76.1 KB Created: 2021-03-18 08:25:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 333f89b3a70ccd4c0f91cfdec4781986 SHA-1: 5842fdeaf29ab362df9ec647dea0c5270c7234ce SHA-256: c4fdc729daee5c7c964167d8ce5792f54b61ceedfb179cebebab423a2761d524
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9995

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=vietnam+veterans+memorial+ap+art+history PDF link annotation
    • http://sarhello.online/nordyne_gas_furnacea60tk.pdfIn PDF document text
    • https://borobufa.weebly.com/uploads/1/3/1/4/131406827/8149332.pdfIn PDF document text
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/6690748.pdfIn PDF document text
    • https://bijawodit.weebly.com/uploads/1/3/4/8/134883407/e131f50.pdfIn PDF document text
    • https://wiludexubusut.weebly.com/uploads/1/3/2/7/132740186/sebumawewewo.pdfIn PDF document text
    • https://lalinixew.weebly.com/uploads/1/3/4/2/134265361/3369896.pdfIn PDF document text
    • http://loxiturizule.sportsontheweb.net/reposekivasagavibosidi.pdfIn PDF document text
    • http://vknacruckalaikov123.xyz/delegation_authority_templatepl6ut.pdfIn PDF document text
    • https://sivajusirev.weebly.com/uploads/1/3/0/8/130814673/e858d.pdfIn PDF document text
    • http://sewonmedix.ru/672033113201j54i.pdfIn PDF document text
    • http://pedumerik.sportsontheweb.net/pakitovedugozav.pdfIn PDF document text
    • http://blubadgehelp.net/jutebinuramiv5f6oi.pdfIn PDF document text
    • http://com-signto5.xyz/revajabikidokagorebuu3v3f.pdfIn PDF document text
    • http://kanshoper.site/brother_mfc-240c_driver_for_windows_10pi3uu.pdfIn PDF document text
    • http://7lessons.space/drifting_rc_carsb8wkb.pdfIn PDF document text
    • https://buvapubadoloj.weebly.com/uploads/1/3/4/2/134265521/ruwulasutewuxer-bukat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sitafefisoju.atwebpages.com/pebirivuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62ec9669-bf8d-4dc7-ab40-4b8fb7c9a584/zadapuxuvuluxukiwaw.pdfIn PDF document text
    • http://wonanikapudidak.atwebpages.com/suxokirapanipuveto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/890c5a89-2a3b-4645-b78a-f02b7150ebde/98364322546.pdfIn PDF document text
    • http://tiruweditivunaw.myartsonline.com/ranesodozulurepeku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daaad767-88ff-47a3-8552-00b7839862ac/rci_2950_dx_mods.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 5184 bytes
SHA-256: 85846a36035b9fc2599c9b47d0eeed326844b54385393c2b9dd87e1dce78fa9d
font_01_sfnt_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 10212 bytes
SHA-256: 7ef6834e5440ff0b6d692d26c325a1fdf820a1003a31c0a5a4bb9fa6318b60c2

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