Malicious PDF — malware analysis report

Static analysis result for SHA-256 d227d6d3a3c5da10…

MALICIOUS

PDF

76.7 KB Created: 2020-12-04 02:58:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 51180f313231a0bebe1b8dc1cde30d3c SHA-1: a92aaabcea82425d7f5e4a18cae82177087d7b78 SHA-256: d227d6d3a3c5da106a0cf2b42f6c3f5b39aeb97f698bd5d6fcfd9670d98151a9
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 0.9997

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=coptic+calendar+2021 PDF link annotation
    • https://digafixi.weebly.com/uploads/1/3/0/7/130776371/vutuvijuvopevizife.pdfIn PDF document text
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/kubomikomavuxar.pdfIn PDF document text
    • https://wubabenababi.weebly.com/uploads/1/3/4/4/134432193/xeredexigudo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e562fb7-fc86-4362-86d6-423a823f7845/fulitapizumomu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d524747e-c818-4f4f-a010-3dcb51ccbbf9/fofidurepetiteju.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/fire_emblem_heroes_guide_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8621b69-2a35-46c9-a29c-afd6fb87afcc/nick_groff_new_show.pdfIn PDF document text
    • https://s3.amazonaws.com/lopazura/wekasivojukep.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/human_anatomy_drawing_book_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/wine_bible.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_off0000cf4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4F 5120 bytes
SHA-256: 0ba4b1a6cfa74adac7d5e0f783f18bb4aca6e85622cc8536df1774105f409357
font_01_sfnt_off0000e0c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C3 10580 bytes
SHA-256: fb6f69a77b821b3fb9920a5e96d09be504a747fe54348b4f9c5e08dcbb3b3cde
font_02_sfnt_off000104f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F5 19856 bytes
SHA-256: 7661ddb8038ccefba2eaea214d0001fddbe90c0780df55e7bc6ab3740ad1af61

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