Malicious PDF — malware analysis report

Static analysis result for SHA-256 88eb07761215725e…

MALICIOUS

PDF

76.0 KB Created: 2020-11-17 10:34:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e27a55577cd1811fe9844614a2368d7b SHA-1: d6d38e623347a6839ccfa2269af8b1a9b6a8a672 SHA-256: 88eb07761215725e008a3af785b4602a63dcdff33c5676bb28b769a8688bfcbc
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 0.9978

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://traffnew.ru/123?utm_term=august+2016+geometry+regents+answers+part+3 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450727/normal_5fb2a2acd9218.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371786/normal_5f95f557345c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365591/normal_5f984dafda493.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370319/normal_5f9bb7650edff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383699/normal_5f905b4fdebb2.pdfIn PDF document text
    • https://nuzibekupin.weebly.com/uploads/1/3/4/3/134338080/sazosamudutum-numozafa-nileb-takoda.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/2bc86e90-9f31-4529-864d-1e75e553fc60/setuxujaxek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3efc6aad-48ea-4b52-993c-2db2fe5f4915/90766218632.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c9536d-445b-4d10-8dcb-d5e03f7fe980/sefer_hachinuch_english.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_off0000cf0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0A 5932 bytes
SHA-256: fd16ad6d80b5539238ceb7dbd1d0c0d04094a3ebc9ff1a052891495ff884b082
font_01_sfnt_off0000e351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 11940 bytes
SHA-256: 71783f58ed76c65bbdd89d3bec8c5463e972d63f2960d3d299a5055c927cef0f
font_02_sfnt_off00010c58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C58 16584 bytes
SHA-256: 3af1e928516464281b716bb571b521be29cc98a8ba6890003b26f0446c0f179d

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