Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07bd4c2b3314b1…

MALICIOUS

PDF

66.3 KB Created: 2020-11-23 07:14:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 597a047eac07679fddab2fc68530de0f SHA-1: 088caa144b6ee75fb57e4c4790ea88f9b581b368 SHA-256: 3f07bd4c2b3314b1a7e8f4d069ec7d2f5819182aba1a9c911155825c1c85c1d4
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-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://trafftec.ru/aws?utm_term=horizontal+bar+chart+android PDF link annotation
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/c1819b0c0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5fab601e5b95c.pdfIn PDF document text
    • https://sazimopugis.weebly.com/uploads/1/3/4/6/134611647/wixubobajivir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410016/normal_5fa1671d37401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417536/normal_5f980b82aeecc.pdfIn PDF document text
    • https://kugodago.weebly.com/uploads/1/3/4/4/134491336/916016.pdfIn PDF document text
    • https://xodetawutal.weebly.com/uploads/1/3/0/7/130774968/01fe15f0ea.pdfIn PDF document text
    • https://dewubolisevibe.weebly.com/uploads/1/3/4/3/134318954/8859925.pdfIn PDF document text
    • https://kajurizekevebok.weebly.com/uploads/1/3/4/5/134586758/04efaa4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455881/normal_5fa39e822082f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455183/normal_5fa7d47fc1eb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490725/normal_5fb51efc0cc7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367286/normal_5f95273c15bbb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4C0 5000 bytes
SHA-256: 904eb6aca670d3e63aeeb821da15cb6daa1051877ee771cdc301be4071986098
font_01_sfnt_off0000d5b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B5 11344 bytes
SHA-256: 0586f788c8c5b5ccb0cc9c71e04106513a59bef9749e00cb55e38f40ac5f60ee

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