Malicious PDF — malware analysis report

Static analysis result for SHA-256 576e89f2a3261d36…

MALICIOUS

PDF

71.9 KB Created: 2020-12-03 07:48:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 8da9ea278f9f5c53453fbd278d18eca1 SHA-1: c1beeb23b1b536558a85e8c76df0cbad0ecc7e6b SHA-256: 576e89f2a3261d3692f448e9c0a77c7ac64fee711e70f6e0428578effc88d563
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to potentially malicious domains, suggesting a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate an attempt to direct users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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/strik?utm_term=d+natural+minor+scale+notes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5fc0759457651.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369310/normal_5fa9525a0341c.pdfIn PDF document text
    • https://xuzexutibezime.weebly.com/uploads/1/3/4/9/134904436/8954c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376098/normal_5fa651be43769.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f88bc81ebc07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418575/normal_5f9eae849f75b.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/murudute/54245209300.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0e90c27a199023ab56552/t/5fc16725f8cdb769c6185689/1606510375517/load_runner_user_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/449f1dd8-b272-4eb8-ae0a-5c7dbe7a2f73/51061111960.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f77d900-21cf-4896-a868-ea60341f8857/29008339019.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_off0000c7b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B6 4944 bytes
SHA-256: 056a50455fef0fc31da6c625d6789f2596a36c81f30603c537e5b8fe65014de8
font_01_sfnt_off0000d874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD874 11076 bytes
SHA-256: 19f8287424337c541c8a0635ea7b7d25d79b60fbbc555c4083e8133a14d3a7bf
font_02_sfnt_off0000fe11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE11 16120 bytes
SHA-256: 46d9b83afd797048ab251ddfc9ca9a6db44f3280724c231f6a80a061bcc6fc12

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