Malicious PDF — malware analysis report

Static analysis result for SHA-256 b839f46d22393652…

MALICIOUS

PDF

75.8 KB Created: 2020-12-15 21:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: d58d7f5a5deb70ae22ee889d5af04bf3 SHA-1: 7b9ea2753a514dfbdcedfac996f8eecad37e6c6d SHA-256: b839f46d22393652f2369f45a55cfc390a01a0a015a2b595baed5dbb23c84c72
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 of which point to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier and ClamAV also flagged this PDF as malicious, suggesting it is designed for phishing or distributing further malware. The embedded URL 'https://trafffe.ru/123?utm_term=exceeds+expectations+in+spanish' is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trafffe.ru/123?utm_term=exceeds+expectations+in+spanish PDF link annotation
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/8196954.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/vepulakanug.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/dikobepibelun/happy_birthday_cake_name_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67f9d548-24fc-4e19-b0fd-5c4d460d12b2/lugedimapabigipojapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/300f5f80-64ce-4419-976a-eb29ef39aeb9/latopobikegurebafuguroje.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc1b24012facd59ceb28ac7/t/5fd0e26512264b5dfdd7f568/1607524965254/viking_chess_hnefatafl_pc_game.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc66f6492c50b1a1e9d5f03/t/5fd20b93ad61ab583190b33c/1607601044752/kufideluvemivupovaxofizog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b11bc4-921c-4e88-acfa-fc8ff7cbdc36/harley_davidson_2010_touring_models_factory_service_manual.pdf.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/free_gta_5_mobile_apk_download_for_android_getjar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d34ed7ad-07f7-41e9-babf-cb3f9d9b5826/54615385550.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AC 3548 bytes
SHA-256: 66a97e97c3fafe1f82c94341496d66b4a6195de751dcdffead0f060c51306e4e
font_01_sfnt_off0000d369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD369 5056 bytes
SHA-256: 2eb42b8dd95353e4948e54657d42c019f07ecbd994f024633f27648d6f889c8e
font_02_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 12524 bytes
SHA-256: a5f2bea41f5439909eb75937f5b2087d180183496097d64be725522c18062880
font_03_sfnt_off00010d82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D82 16068 bytes
SHA-256: eaa138153142e1b202f6e132b5b79d2ae4483da1523e62d7c19f47fa5ad289e7

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