Malicious PDF — malware analysis report

Static analysis result for SHA-256 61343bd8f0023db1…

MALICIOUS

PDF

66.0 KB Created: 2020-11-13 22:38:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac1f28c5530d01785f361725c4694901 SHA-1: d2bced9f48f43de04b5589089e9a9b156b0a1c39 SHA-256: 61343bd8f0023db165d3818eab80a416448eda02b79156dae44a667e3ac92e22
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-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://trafficel.ru/123?utm_term=cookie+clicker+2+hack+download+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412160/normal_5fa484c33f3ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422180/normal_5f997cee30fee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459062/normal_5fa8ebe5ed9dd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_5f86f9ac68d69.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366987/normal_5f874996eb43e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385207/normal_5f8e6d01d6a0d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427093/normal_5fa67c0e2a95c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5f9bd28fb9215.pdfIn PDF document text
    • https://xulegavumorojok.weebly.com/uploads/1/3/0/8/130813780/kodefirisufiviri.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366305/normal_5fa5a529a2802.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/jipowumat/8855053629.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c60d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC60D 5176 bytes
SHA-256: a494151c5a53b82dba5b5e38aa74205eb7085f0a93e4fbe7f2daca332bce9f8f
font_01_sfnt_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 10544 bytes
SHA-256: 9d7cd5c93da44bc3fe2e2540df29a5555caa8fa426a6649612736971adfd3384

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