Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d71b6476bfe749d…

MALICIOUS

PDF

80.0 KB Created: 2020-11-18 09:09:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 2312dbf595d3fa1018044aa7ef370b27 SHA-1: e32059e1482df8c829a9c074f2ecceb927d113f7 SHA-256: 4d71b6476bfe749dd903113e3632b4867fed3f6e9a3d019089dbca120499d5c1
212 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a pattern of linking to potentially harmful or spammy content. The ML classifier also flagged the document with high confidence. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to direct users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9119

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=self+reliance+emerson+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5fa99ea875437.pdfIn PDF document text
    • https://fovejurifeke.weebly.com/uploads/1/3/4/3/134342496/7878836.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/66dcffb06.pdfIn PDF document text
    • https://kololeranazi.weebly.com/uploads/1/3/4/5/134583506/timasixoburoz-femafijozamek-maxopusa-foxewaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f89ac6482b08.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/satudifin/bufofojona.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51689035-72f8-466b-ab86-291eb7dec792/74197994537.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/newugiguwuruwutawira.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/1536145247.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/24725666548.pdfIn PDF document text
    • https://s3.amazonaws.com/padadutiseni/cub_cadet_mowers_zero_turn_maintenance_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/37512502871.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/skull_diagram_front_view.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a85c9d74-19b0-40f1-b40e-c18ec880215f/piano_theory_cheat_sheet.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn 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_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 5404 bytes
SHA-256: c0eecb08dcb50ee4f4993c9f6fd6cbb287c6b3af8c3683798fdcf0c23c9c9939
font_01_sfnt_off000107da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DA 10560 bytes
SHA-256: 47f9e2f90c987cc0f14517c1a9269562d597081468603f284ddf34d46009601e
font_02_sfnt_off00012c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C3A 16176 bytes
SHA-256: ec9986929bb8e82e8659f3ce4caa92260035ff1cb75e76a0e0d57d8883caacd9

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