Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c72d068767cb6b…

MALICIOUS

PDF

79.6 KB Created: 2021-03-20 21:24:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3cf8d1fb469df4209f9e58ec2b18f82c SHA-1: 590b67a3734ae9522505c5ac11eed162c6d0f0e0 SHA-256: f6c72d068767cb6b0701140c80564b6edb7baa3f0e04d64691b5faabd7b653ec
156 Risk Score

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 0.9997

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://dafemum.ru/award?keyword=workbook+for+cognitive+skills+pdf PDF link annotation
    • http://vitrinachel.ru/rulewiditadunumerujibuwimoj47.pdfIn PDF document text
    • http://wonnaturila.space/dota_2_guide_indonesia_slardarkk51y.pdfIn PDF document text
    • http://litufunijefud.iblogger.org/pearson_physics_textbook_download.pdfIn PDF document text
    • http://bagabipum.iblogger.org/73572447099.pdfIn PDF document text
    • http://eurostore.info/tivafozumomegedobikinirujmeog.pdfIn PDF document text
    • http://shop-kid-toys.online/497310216633cqt9.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://s3.amazonaws.com/jezobasit/easy_christmas_pub_quiz_questions_and_answers.pdfIn PDF document text
    • https://d7ae471b-a447-437d-81b4-4e603f8679d9.filesusr.com/ugd/0a3240_1f0145398cb04c79aa93b2aed03af6da.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/widur.pdfIn PDF document text
    • http://bavalibonoz.rf.gd/download_sketchup_2019_crack_32_bit.pdfIn PDF document text
    • https://s3.amazonaws.com/lodazojamuva/article_writing_for_class_7_format.pdfIn PDF document text
    • http://jowekenivuzex.rf.gd/kosugobip.pdfIn PDF document text
    • https://s3.amazonaws.com/xabalaru/20595714269.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_868c96686cbf4abd87652e760712245a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/63056638264.pdfIn PDF document text
    • https://4328a374-8b5c-4134-9cef-e132ca5fc89d.filesusr.com/ugd/6732b1_a49f590a8508442a8913321fde22d007.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sukedil/browsing_history_passview.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/cms_responsive_website_templates.pdfIn PDF document text
    • https://14535e1a-360a-4d01-a655-fa33e115c80e.filesusr.com/ugd/b222ea_be5c59d7ae0c4a8bb8427b81300f73fc.pdf?index=trueIn PDF document text
    • http://sekupudim.rf.gd/comparison_of_adjectives_worksheet_grade_4.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_off0000ed5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5F 5176 bytes
SHA-256: 3909cf8a8d9bf4426f91bb76b2ec2aee528f75b6fcdc5f18fe955f27bb8d8316
font_01_sfnt_off0000ff1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 10396 bytes
SHA-256: d06157c0dbca62e875d01efff02a41f37ebd0fca2052a55085fce2fc85ea9cbd
font_02_sfnt_off000122b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B5 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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