Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b58143351a4f6d5…

MALICIOUS

PDF

89.7 KB Created: 2021-04-23 12:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 497e9b3f32c54ea530aed9c5adb754fe SHA-1: 16f3640dfbcea48395b870d3576ce1d8fcb237f7 SHA-256: 7b58143351a4f6d5f4f8ece7d0aceec4495fc2eb87f9546d15cd33ff698e1635
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-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://midufefew.ru/strik?utm_term=how+do+planes+overcome+gravity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485149/normal_6011974b62882.pdfIn PDF document text
    • https://xaxomawiso.weebly.com/uploads/1/3/5/3/135329970/5902396.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421630/normal_5ff0e4bed1f0d.pdfIn PDF document text
    • https://votadewigul.weebly.com/uploads/1/3/0/7/130775387/sazever.pdfIn PDF document text
    • http://keruluzo.medianewsonline.com/48862233410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382782/normal_5fe8f8d16518d.pdfIn PDF document text
    • http://pinopizo.sportsontheweb.net/45436609129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403822/normal_5fd11cc3219ee.pdfIn PDF document text
    • http://subexadedesu.iblogger.org/english_lessons_for_high_school_students.pdfIn PDF document text
    • https://koloputumoti.weebly.com/uploads/1/3/4/8/134887370/518f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459483/normal_60590802b1107.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sipijukat.epizy.com/brainstorming_steps.pdfIn PDF document text
    • https://s3.amazonaws.com/wovedukevikov/free_sat_practice_test_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/soapui_testing_tutorial_by_naveen.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/77947827928.pdfIn PDF document text
    • https://s3.amazonaws.com/xoguwavosuje/28572681880.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_off00011c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6E 5608 bytes
SHA-256: 0caa911be365c3d0a4d81bea902d9fc73b977503ce38ea9c05f480432c409876
font_01_sfnt_off00012f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F87 11892 bytes
SHA-256: 953fbc24a0a9990795d63d04ccd5da01cb0ab079433463d6d8f2fad73374bcda

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