Malicious PDF — malware analysis report

Static analysis result for SHA-256 192c017af727c335…

MALICIOUS

PDF

80.4 KB Created: 2021-02-20 15:55:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 540d8a7985c39ff28dc7cf326f3382dc SHA-1: 3f9b6acf8a542ecf02fe84df5cce526a580d402f SHA-256: 192c017af727c3354b2c3254c7c10ccc4c9f08a0dc0abda0f942bc9cc6d35366
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wix?keyword=starcraft+2+units+counters PDF link annotation
    • https://barufaworu.weebly.com/uploads/1/3/5/9/135957986/e60051d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451220/normal_5feb5e8d9c25e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460944/normal_6028ad3853e60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491436/normal_5fe59406c243b.pdfIn PDF document text
    • https://cdn.sqhk.co/depivuni/h2jegdY/barutu.pdfIn PDF document text
    • https://nemaxololele.weebly.com/uploads/1/3/5/3/135304154/matezirabi-nifurepe-xoluw-rupajejodobaga.pdfIn PDF document text
    • https://cdn.sqhk.co/goberirud/eiahiaA/61914479676.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382412/normal_5ff68f973a38b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487399/normal_5fd262ffc58e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424040/normal_5ffbafe09c009.pdfIn PDF document text
    • https://cdn.sqhk.co/jigugabopu/60ggJgg/tenewulaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380382/normal_602ff0de3108e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450259/normal_602e244bd67f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_60220ef09ebff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4529893/normal_5ff65fcc118a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387567/normal_5ff0eda3333be.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/ajiWjgF/subway_princes_runner_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF622 5080 bytes
SHA-256: 05458fec83c4c2f0fc3eda5714953ad5af2edfc90a63ba5f2ff4e0492efeba26
font_01_sfnt_off00010774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10774 14596 bytes
SHA-256: a97c803e2cf78bf8b9211ab917c8c24515694b030c9d5a6767d65134f973b42b

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