Malicious PDF — malware analysis report

Static analysis result for SHA-256 94ffb527252a8133…

MALICIOUS

PDF

67.1 KB Created: 2020-11-20 09:22:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5babba79d91cd6da22d9a16ada7d2170 SHA-1: b7c5eca7110cc490be0cc82d31084ed49208441d SHA-256: 94ffb527252a8133e438fce1c4db74a55b44a9a69004fa78872b384ca7ca2992
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, with a significant number pointing to PDF files hosted on platforms like Weebly, suggesting a link farm or redirection mechanism. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the document is designed to direct users to potentially harmful external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafffi.ru/aws?utm_term=windows+forms+app+settings PDF link annotation
    • https://nudiwosesi.weebly.com/uploads/1/3/4/3/134317077/9218430.pdfIn PDF document text
    • https://zitidatuviwe.weebly.com/uploads/1/3/4/4/134493200/3436566.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_5f948f0dec46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388271/normal_5faa0c75700e9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369499/normal_5f89959bca279.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/9562264.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fae6b932f110.pdfIn PDF document text
    • https://walutosewog.weebly.com/uploads/1/3/4/3/134312240/talafakunapezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5f9afaffd10ec.pdfIn PDF document text
    • https://wesojejupeledaw.weebly.com/uploads/1/3/4/4/134446418/nejirepawowudel.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/56d21218-2202-4274-9896-370fd08add2a/l_alchimiste_paulo_coelho.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb6a83d0-3fa4-4571-a408-bf2b61070bee/81731316275.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e471dc3-bb0f-42a7-bd1d-a4d6fb28480a/teaching_vocabulary_strategies_and_t.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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 5432 bytes
SHA-256: 8909ddb65a5d4b9abc0fd94b3ccaf34a894a2b38a008892392871bc85edba162
font_01_sfnt_off0000dd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD9C 9936 bytes
SHA-256: 148f7b2c1ad845002e385a5c4a156f8c07e8a769efd52bd8812104773a55713a

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