Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f6ff21fd7881b0e…

MALICIOUS

PDF

137.3 KB Created: 2020-11-25 11:13:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 67a38ee935f1673c38c5a94205e13a70 SHA-1: 10b5b1655052883d406de9d221af24d3c39ed237 SHA-256: 9f6ff21fd7881b0ef57122d8ecac21f8338894220ef2fbe20658caf3b7c885ef
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 0.9996

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?utm_term=pen+and+ink+art PDF link annotation
    • https://kipujoguburaza.weebly.com/uploads/1/3/4/3/134321983/kuwodekeniso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501028/normal_5faf79f1db3b8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369773/normal_5f93bb9fe6c1b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416935/normal_5f983fbceefac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486213/normal_5faf2f799bd74.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fa67cdead534.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421342/normal_5f9a8ed6b3ffa.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/74307b8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/229b9712-64d8-4338-8530-a21677f4201c/3789182189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e477b73-7aa1-4598-a6b8-e8e809fe79da/bimezusulebotoju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f5ba18-ccc3-4e42-ab28-410b5f61b2ff/28425155437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2830d0ce-9516-4573-8156-8271134880a1/14127959153.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/6646727314.pdfIn PDF document text
    • https://s3.amazonaws.com/bevarolimesale/data_structures_and_algorithms_in_python_paperback_2016.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cc95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC95 4352 bytes
SHA-256: 1076eb64b877eb968aa44dbef7af9c882f0413deef82f9273cbfab813a397966
font_01_sfnt_off0001db56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB56 20688 bytes
SHA-256: 2f02d210d6201270daa616a1a74bf6edf91f347cff9886e6a847199a23c31838
font_02_sfnt_off00020a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20A82 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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