Malicious PDF — malware analysis report

Static analysis result for SHA-256 a606f94110e86df7…

MALICIOUS

PDF

76.2 KB Created: 2020-12-19 02:11:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 6cd9a7176f60a0ebe2ee6d0d656ffa83 SHA-1: 9f72f8b02dabc35857004e68598eba4ce665f02f SHA-256: a606f94110e86df797e66a5a48fd987d4a5511a0b59147e04d0901b0490a6886
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which are hosted on dynamic DNS services or free hosting platforms, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious sites.

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://trafftec.ru/aws?utm_term=ragnarok+renewal+archer+leveling+guide PDF link annotation
    • https://gatodewa.weebly.com/uploads/1/3/4/6/134627503/motilafiruziluz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376359/normal_5fa8224523f1e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369788/normal_5faf3889b33ac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420748/normal_5fc4dcc72c706.pdfIn PDF document text
    • https://botimosiwipam.weebly.com/uploads/1/3/1/3/131398053/3058393.pdfIn PDF document text
    • https://wimejevufafej.weebly.com/uploads/1/3/4/3/134379448/sudafedemawigogu.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/cc32636b-62b0-45d9-a0f2-b35c100a6010/mumusevesumamavigeto.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b12086-bb39-4377-8aec-8ae4b9be2290/low_back_anatomypain.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aa34390-e4be-4c77-955f-9318b7a79065/jizedixopolugopimerivat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44894373-a056-4135-99cf-96216c1e4c02/13370186909.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_off0000ed76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED76 5248 bytes
SHA-256: c0dbca8a8b7c38f80c080d91fd505d405c8190c411a12cc113d09f7f88a33c0a
font_01_sfnt_off0000ff69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF69 10800 bytes
SHA-256: 0b921517dc0b278d26a42fc6c24e4f4d15bf4ae246c5c41d0a78b0d01e1c70fd

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