Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9ac14b481d2e60…

MALICIOUS

PDF

72.3 KB Created: 2020-11-21 11:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 26faed51d39739b9bff9643c34b1ce0f SHA-1: 9cad9e10defbff0083c1a7b6fd62a3149f95c52b SHA-256: ad9ac14b481d2e60046ad444bec93c091a6d0a8ca21272d560e0780bc0ebf27e
156 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 0.9998

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 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://traffine.ru/123?utm_term=bowling+green+r1 PDF link annotation
    • https://mogijoduvide.weebly.com/uploads/1/3/0/8/130814471/6236028b94.pdfIn PDF document text
    • https://ziwugedaxuz.weebly.com/uploads/1/3/4/5/134501511/5939702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457281/normal_5fb2d5fe0b356.pdfIn PDF document text
    • https://revibafejinaj.weebly.com/uploads/1/3/4/4/134485322/68c1eba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461791/normal_5fa6f4da3c267.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369774/normal_5f87d92a0d3d9.pdfIn PDF document text
    • https://nenojidadexodu.weebly.com/uploads/1/3/4/3/134351563/migatuwagagumo.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/xefejevife/underwear_size_guide_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/tiduro/jenibosaduloguxozitu.pdfIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/77194309730.pdfIn PDF document text
    • https://s3.amazonaws.com/sazariwapa/wowedodobifitejodo.pdfIn PDF document text
    • https://s3.amazonaws.com/vifusupegiza/13662490004.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/506e009f-6e7b-4e19-a94e-d9c50bdc0368/jugit.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/alcoholismo_y_drogadiccion_causas_y_consecuencias.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/m1_carbine_sling_parts.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
    • 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_off0000c96c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC96C 4656 bytes
SHA-256: e1ef3c4e97647ad07e783dfffcaab1126db3fd0b53ac6f95f2e796c5360c36e5
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 10804 bytes
SHA-256: d5f4c8f8cfcc9194c31af347895c22c96126ff7423f03a887274adfc398bd638
font_02_sfnt_off0000fe6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6D 16060 bytes
SHA-256: 4ef9506ee11a349461550e6b437e3786686b598308a87786035880d16624999d

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