Malicious PDF — malware analysis report

Static analysis result for SHA-256 47a5aad86679e7e0…

MALICIOUS

PDF

72.4 KB Created: 2020-11-24 07:28:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 29bce988b9eb077ccf740f217d5fc468 SHA-1: 90e7a066b75d9ac9e8ba69e4de4832a7390d8092 SHA-256: 47a5aad86679e7e0a89ef887da289c0cd952091c0ee6ff588ead5b10820d19b3
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM'. The primary external URL, 'https://traffking.ru/strik?utm_term=data+communication+and+networking', is flagged as unknown reputation, suggesting a malicious intent. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links strongly indicate a phishing or malicious redirection attempt, likely delivered as a spearphishing attachment.

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://traffking.ru/strik?utm_term=data+communication+and+networking PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fa4927fefc24.pdfIn PDF document text
    • https://nupanirofedodav.weebly.com/uploads/1/3/4/4/134470916/vimifudoregikoz-wuzukir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379231/normal_5f8d491fd60fb.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/8068140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5f8982b775628.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/unblocked_cool_math_games_66_at_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b9e0bf0-cc79-42fe-91c4-38be2b1ca67f/21499399959.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ecb46de-d7b5-412f-bf89-16a469ed91b0/80775675368.pdfIn PDF document text
    • https://s3.amazonaws.com/vebisop/amorepacific_group_annual_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd4dbf94-52bf-48e4-8518-c01e0485e6b6/exerccios_de_redao.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/90748759063.pdfIn PDF document text
    • https://s3.amazonaws.com/fizup/telabizufopadoxa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe550c9-0bfd-4cf6-8fe3-eec775800bc4/fnaf_2_unblocked_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jiwisigetizoxif/sepejajilutikuf.pdfIn PDF document text
    • https://s3.amazonaws.com/salosibejodod/sample_letter_of_acceptance_of_appointment.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_off0000dc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC35 5204 bytes
SHA-256: fff7f2464111d48d3a0d70f89e51772025ba01638e97a0f179b390f24696b9eb
font_01_sfnt_off0000edf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF2 11436 bytes
SHA-256: 6b125cb30f3d837037580ee00423696b4e1571f2240845a1e90bf0a9c37676c5

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