Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3a846dd9753bd8…

MALICIOUS

PDF

76.0 KB Created: 2021-03-17 16:20:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: a71a637e29e396d099939549147c548b SHA-1: 59dc70dccbdc69469a268ee66600ec2b8036ffa8 SHA-256: 0a3a846dd9753bd84221b85d981f09797965436592ea5194e54db174f321c550
186 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 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/wix?keyword=ninja+turtles+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366952/normal_5fd1819deda9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379720/normal_602d5e148a64a.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/mil-std-882d_risk_matrix.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_602f150c8bd25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385617/normal_5fe5e6ce62ff0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490917/normal_60040f81057f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372681/normal_6008fc9a675ba.pdfIn PDF document text
    • http://summ-ita.space/does_walmart_do_vaccinesyohyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413243/normal_600cbf52b049c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403561/normal_603cf3749101c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388173/normal_602611bbaed1a.pdfIn PDF document text
    • http://jushq.pro/45787574682yi231.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_603b116bc5250.pdfIn PDF document text
    • http://kazaxukiga.getenjoyment.net/compound_bilingualism_and_coordinate_bilingualism.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_c4258a87e5ca4e8c96709dcddeb58991.pdf?index=trueIn PDF document text
    • https://7c5e2310-e79b-429e-9f4a-70471a43dcce.filesusr.com/ugd/8ec1ef_d2261e6d2d6f4e3a9657d334c6300e98.pdf?index=trueIn 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_off0000e9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CB 4920 bytes
SHA-256: a63e836d562f5fe574313703cc9eabba45eced8a43b8e7e1370ce7efd3602822
font_01_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 13060 bytes
SHA-256: f0606a586cf8ab881f389e04de7940680e1b08a47a71a18f314e4828094cd028

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