Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6d9bbdc4b81cc7…

MALICIOUS

PDF

81.1 KB Created: 2021-05-26 21:02:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cad6be8147cb7f9986155ed153b8785a SHA-1: e1557363b9d9625c2421075d7a13ff02028fffa2 SHA-256: 6f6d9bbdc4b81cc72a10ec81106bc494df3199312b3db21e563461205a774428
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on Weebly, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' point towards an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=can+i+buy+a+universal+remote+for+my+vizio+smart+tv
    • https://bifutizuwosedi.weebly.com/uploads/1/3/4/6/134645412/tudufim.pdf
    • https://xisagoruno.weebly.com/uploads/1/3/5/3/135332800/5372351d45a14e.pdf
    • https://cdn-cms.f-static.net/uploads/4460686/normal_60464cfea4505.pdf
    • https://static.s123-cdn-static.com/uploads/4445118/normal_5fefdd02420f6.pdf
    • https://ravijirigiraga.weebly.com/uploads/1/3/4/6/134649302/689e2.pdf
    • https://cdn-cms.f-static.net/uploads/4474448/normal_60665cc42a006.pdf
    • https://dexugagemer.weebly.com/uploads/1/3/4/7/134715037/1574269.pdf
    • https://cdn-cms.f-static.net/uploads/4475197/normal_60541bf6914fc.pdf
    • https://povaxabo.weebly.com/uploads/1/3/5/9/135976235/1936913.pdf
    • https://luruxelu.weebly.com/uploads/1/3/2/6/132682974/futowa.pdf
    • https://static.s123-cdn-static.com/uploads/4481056/normal_5fe2ef6fa90a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/af35aa4a-e664-4e97-ba7a-4189804b9b6c/cul_es_la_funcin_del_sistema_endocrino_en_los_animales.pdf
    • https://uploads.strikinglycdn.com/files/eda60e64-2479-4143-a416-0a60e43517c2/what_should_i_say_in_a_security_interview.pdf
    • https://uploads.strikinglycdn.com/files/0f8b06d2-2d71-46d0-b3df-5b0f90100c04/icf_definition_of_coaching_and_pledge_of_ethics.pdf
    • https://uploads.strikinglycdn.com/files/80b53e91-a364-4d3a-972e-bebba778d9c2/sovezawigifi.pdf
    • https://uploads.strikinglycdn.com/files/62bb6161-b9e4-4a3b-9f17-2401305fb876/after_we_collided_australia_release_date_itunes.pdf
    • https://uploads.strikinglycdn.com/files/2be133d1-f4d3-4bde-b72f-92b2df217a30/hero4_silver_review.pdf
    • https://uploads.strikinglycdn.com/files/f77ab32b-59d0-4548-93c0-8d72c4a9d3e1/how_do_i_make_text_background_transparent_in_paint.pdf
    • https://uploads.strikinglycdn.com/files/1065feda-10f3-4597-b29c-38319b5e184d/gulakogux.pdf
    • https://uploads.strikinglycdn.com/files/ef216f2f-c0da-4121-8ec0-33080d926b9d/is_it_worth_fixing_a_dyson_vacuum.pdf
    • https://uploads.strikinglycdn.com/files/89dfc4b6-fae5-4266-8baa-28a5287e852c/nelixofotopeju.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efc6.bin
1851379b7d95e3e7845c5b4dbec319c3f21ed2d9ead039a4d50c3e313d38b350		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 5168 bytes
font_01_sfnt_off00010159.bin
11454ba0694c2350bab0f93f700ad2390645700da433323e27fa3fc0930bc353		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10159 11700 bytes
font_02_sfnt_off00012896.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12896 4324 bytes

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