Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4f4cc2985ad3ce…

MALICIOUS

PDF

77.3 KB Created: 2021-05-20 08:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b447eeb2d659b858b97bc3420c2d2ab8 SHA-1: eb42173070b6849b48b184cd1ab9229a95dfbd06 SHA-256: 5c4f4cc2985ad3ceb5ad43cd28a56621c8ce127d5936952eb28437df87450f5c
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://kuzutuzo.ru/strik?utm_term=reading+comprehension+worksheets+5th+grade+multiple+choice PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384461/normal_6039df09ede64.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418566/normal_5fc71e2526a18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476123/normal_6028b7ece946f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427785/normal_604637928bd5f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475197/normal_604fb6768cec0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450415/normal_5fd32c977cf22.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393359/normal_601f6c5f06540.pdfIn PDF document text
    • https://roxagidu.weebly.com/uploads/1/3/4/7/134748987/8899387.pdfIn PDF document text
    • https://denogowozule.weebly.com/uploads/1/3/5/3/135326247/varosulefixabe_vasusem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365563/normal_5ffe295412c03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460975/normal_5fc7fbc047912.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412582/normal_6040acc22e0f3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe26785e1a1d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388427/normal_5ffc2680ac3cd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425487/normal_5ffb17e40cfe5.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/fa461b45-14af-4a14-8ff5-a6d1f03992b4/camelid_sacrum_in_the_shape_of_a_canine_size.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d578521-3e72-44c1-88bb-64692e8b5098/monster_5_gum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35e229b5-db7d-4637-a46a-89c14e4d33df/american_dad_scripts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/304be16a-b03b-4a1f-ab95-1cac53d93ec9/norajabagisivazapivu.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_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 5772 bytes
SHA-256: 16f1d4e275c26de72c5d2b57e6e7dd6b2d243eef215b1f79b614ab18ba6a4214
font_01_sfnt_off00010225.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10225 11040 bytes
SHA-256: ef8edd39ef6f9937a15fbcbaa1cfb72e146cc7501e405c4f39eaeae1092a6e82

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