Malicious PDF — malware analysis report

Static analysis result for SHA-256 adfc9a537563a67e…

MALICIOUS

PDF

81.4 KB Created: 2021-05-20 17:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 193b6b403e77131ed000133edf265bbe SHA-1: 95a378d981db12a2aec57f7ec5213141938ac62a SHA-256: adfc9a537563a67e7b1ff2cf1e64b9ae21e6c6ab91b9c652842c308df92a7488
156 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 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://pelibifir.ru/strik?utm_term=how+to+clean+lattissima+touch+milk+frother PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422136/normal_6025f4d695bf4.pdfIn PDF document text
    • https://lofivate.weebly.com/uploads/1/3/4/3/134307733/9046565.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420434/normal_603404cd296be.pdfIn PDF document text
    • https://wunovolal.weebly.com/uploads/1/3/5/3/135311751/bozapomixujati_didemagixulep_lebimokewokef_nixofe.pdfIn PDF document text
    • https://pesopipuni.weebly.com/uploads/1/3/2/3/132303043/721730.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467927/normal_60604ea89239a.pdfIn PDF document text
    • https://kawowubizi.weebly.com/uploads/1/3/4/8/134864460/6996646.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/e101a56d-88df-4723-8214-99e6bd2b0364/19730718515.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f205cd-204a-40c1-9bf4-a16850122c45/best_quotes_from_tibetan_book_of_living_and_dying.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56b51093-acd7-43e0-bcf4-b0a9ea4b0be7/kupis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c96d29b4-b9c4-4984-a296-184217e920c8/29634335346.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c12782d2-7dc3-4519-b411-09129d73a4f4/renesurazisezomilevina.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3be7fc2a-503e-4abd-a024-dfe9e0154bca/lopoxafodokojepesa.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/how_to_crochet_hair_braids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83406ef8-2d4d-4115-9058-b02d772cb5dd/the_fraternal_social_contract_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c70c9620-62c1-491c-9725-3e41b0e02d68/grammar_quizzes_for_college_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a16444-e3ce-4edd-b3f2-a08e4b1e66d9/add_text_to_file_c.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_off00010087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10087 5240 bytes
SHA-256: 9904cbd892f8874bbf61547ef73dd856003093cc598378e35977149fdcdb5eb5
font_01_sfnt_off0001123e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1123E 11172 bytes
SHA-256: 182ca8c3091965f0ed6309a1fd5651feb862b84673e2137c101c1ddc74220e0d

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