Malicious PDF — malware analysis report

Static analysis result for SHA-256 457dd5ce70268d07…

MALICIOUS

PDF

74.7 KB Created: 2020-12-04 23:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 43ed6c4ccd23a4fe3532b07e1f640c22 SHA-1: d7a099450b73a16a92412ee8e1e140e954b77030 SHA-256: 457dd5ce70268d07b4a85a92490a5041fea8622db609b4c366708ad8cf836ac0
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://trafftec.ru/strik?utm_term=a+man+with+a+plan+quote PDF link annotation
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/97878.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369638/normal_5f881ba38a56f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472475/normal_5fc501dc7fb73.pdfIn PDF document text
    • https://jemajodelevo.weebly.com/uploads/1/3/4/3/134394711/subozanujavoj-bomadasisufub.pdfIn PDF document text
    • https://vuwakoge.weebly.com/uploads/1/3/4/3/134368269/zobej.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://static1.squarespace.com/static/5fc0c3cd92c50b1a1e76da16/t/5fc54f9c9b1ed035388cdb86/1606766493385/lowes_table_saw_kobalt.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/379ba783-a4f5-483e-a862-b3658debc698/tumokamabadugofapukelafam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5acb43fd-144e-4fe6-864e-81fdc3a97fd9/popsicle_sticks_tower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73d1c229-0287-4551-8245-4b41fc65cafb/92577814868.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a755ab7-441c-446d-9d68-501ab03b6e8f/royal_oaks_elementary_woodbury_mn_home_page.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd693eec-5fae-4b1c-ac15-00ec203ee96e/rojora.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF8 4876 bytes
SHA-256: d381dc3b9064f275599dabc24b364ce78c00f1e9754baf38512ce3778b7cb27f
font_01_sfnt_off0000ec6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6E 10508 bytes
SHA-256: a5005c00af789f1bccb977231511c2c0c26e1dce1f8c54ccd23a1c3d6665fd0f
font_02_sfnt_off0001103e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1103E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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