Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0f4c631016a7543…

MALICIOUS

PDF

42.8 KB Created: 2020-11-09 13:02:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1904d6961a4d29f314f36620f3b35069 SHA-1: 9be85aa3202f2d55b687b85afb3886656b6b348a SHA-256: b0f4c631016a75430382d9250804a09a6eb496ec5b5f686dec47d610785783f9
96 Risk Score

Malware Insights

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

The PDF contains embedded URLs and a document body that mimics a news article about Demi Lovato's boyfriend dying, a common lure for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates the presence of numerous external links, with one pointing to a suspicious URL on trafficel.ru. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://trafficel.ru/aws?keyword=demi+lovato+boyfriend+died PDF link annotation
    • https://xoraxabaxid.weebly.com/uploads/1/3/2/6/132682630/ribinokola-diserolejux-vitopigelurag-vanafaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405925/normal_5f9d4740461c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_5f87479961195.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/70285048880.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromopelurab/gotozetifuwufegugule.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/fasivuzuledod.pdfIn PDF document text
    • https://s3.amazonaws.com/jesidofefe/82531868524.pdfIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/tcs_email_writing_questions_with_answers_download.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/gosavoxunegigaj.pdfIn PDF document text
    • https://s3.amazonaws.com/xafuluxel/xevadepimevunolelelor.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/inflammatory_diseases_rosacea.pdfIn PDF document text
    • https://s3.amazonaws.com/tagorarib/61052772856.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12b58c42-38ff-453f-8dcf-8ec3fd10cd7f/51987660107.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/31224328691.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_off00006605.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6605 5176 bytes
SHA-256: a771bea31167e6924e165850fbd3cdfaf90607cb0f495ead0f95c110207a8e42
font_01_sfnt_off000077a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77A0 11356 bytes
SHA-256: 43259371e1eb40ac8772f04e9062399a4211d78195c5b4afbf7d60bd171cd324

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