Malicious PDF — malware analysis report

Static analysis result for SHA-256 73de9b1bb6d4b30f…

MALICIOUS

PDF

68.0 KB Created: 2020-12-05 09:24:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b5ee3866a9d938688153929078479ea5 SHA-1: 784cd5ccea86117861297a9ecaa36581d6f2bae8 SHA-256: 73de9b1bb6d4b30ff802911b9246ffd280e000de9e2a612ed25bc18b2ce8e8e6
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, suggesting it is part of a link farm or phishing campaign. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly indicate that the primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=contoh+silabus+bahasa+inggris PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460055/normal_5fa72295b4aa8.pdfIn PDF document text
    • https://wikabolodaj.weebly.com/uploads/1/3/4/6/134648749/bebovedujoxodinupe.pdfIn PDF document text
    • https://jikubefu.weebly.com/uploads/1/3/4/3/134318914/vuximap.pdfIn PDF document text
    • https://luzofimufabo.weebly.com/uploads/1/3/4/5/134590143/5544125.pdfIn PDF document text
    • https://jurujixomegisi.weebly.com/uploads/1/3/4/7/134745805/vowopekijijapewabupo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406455/normal_5fb3c6f44128d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412780/normal_5f9e790d053cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f87583f7ff95.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fbfeb102bbd74065800e14d/t/5fc62b053f75b16643a68b31/1606822664355/50419541451.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4a205147b14804294e2e/1606371885207/phillips__cohen_associates_uk_ltd.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc10fb5bda9c57a97bf17be/t/5fc170644f9837572015e6b5/1606512740963/77995438371.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc552d70a2757459b004032/t/5fcacc0cf7b7c3392668fdd4/1607126029046/md_emu_free_roms.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd21d2771f5d42aa23dc3c/1606230484823/poulan_2150_service_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc128c411f6a419848742fc/t/5fc542fb9d793648403a001f/1606763260477/national_honor_society_pin_ebay.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_off0000ce28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE28 4992 bytes
SHA-256: 7c2e7397b149bf1e935a6150eb2e3cb806c5be176c64045fa09d0d5bb8d63104
font_01_sfnt_off0000df15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF15 10540 bytes
SHA-256: 7e3ca4c1552ed03b7714baa65b3de8953d9f194517678b4c076162dc9f7799ef

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