Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a222b4d1980fcdc…

MALICIOUS

PDF

66.8 KB Created: 2020-11-10 22:19:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: d97ba9a43fa4fd7f10bc5caf94902be7 SHA-1: dc3ccc67580f2c293d9e3ac1eed670f1db9ed02f SHA-256: 3a222b4d1980fcdc1913c215ffee6a4c388b2555b37caae747b995381c306d58
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://trafffe.ru/123?keyword=fast+typing+games+unblocked PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366362/normal_5f8cfd30e8420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_5fa2b02ba79ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f8e1aa360a4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443801/normal_5f9d008ad718a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fa69dd3d6ebf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428335/normal_5f9995ccb79d5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384307/normal_5f8e9c12cc4bd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5fa287d25f56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367290/normal_5f8b4ad2cc898.pdfIn PDF document text
    • https://bubiwodepu.weebly.com/uploads/1/3/2/8/132815961/giguviladomimis-sazisoles-xadarok-zezorevaxoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386076/normal_5f962098e4eb8.pdfIn PDF document text
    • https://tuwebiparixe.weebly.com/uploads/1/3/4/6/134674666/b50aab06d41c719.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f87090738e37.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/c61c1f26-1dd6-4931-af0e-75d1847ac056/lidizaditudomunalemu.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_off0000c878.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC878 5556 bytes
SHA-256: 287fbcf1b2d7157f2f830f3badba87c0d1cef86c78c3a4965cee3564312d10a0
font_01_sfnt_off0000db54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB54 10340 bytes
SHA-256: 5742aca63d7758e5b93fad6377da61a4e77046d164df7b6212c7a8e0147739c4

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