Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0618d18aae53751…

MALICIOUS

PDF

96.6 KB Created: 2021-03-28 05:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 10a59321950d5d9d77ae32385c9fd364 SHA-1: 8118d10cf6f1bc4f6a1a0b9f25da60570637e498 SHA-256: f0618d18aae53751ca14f63269934f172988aea5302623c7fdd59e9bed1e39b7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The presence of multiple unknown and potentially malicious URLs, combined with ClamAV detection and an ML classifier flagging it as malicious, strongly suggests a phishing or malicious content distribution attempt. While no scripts were directly extracted, the PDF structure and link farm indicate an attempt to redirect users to harmful sites.

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://fokemale.ru/wix?keyword=how+are+striations+%2528internal+ballistics%2529+created PDF link annotation
    • https://cdn.sqhk.co/gojikanemiju/aXKMhgc/74619173761.pdfIn PDF document text
    • http://wazixusazajafem.22web.org/easy_similar_shapes_worksheet.pdfIn PDF document text
    • http://nusowutevu.getenjoyment.net/budgetary_control_techniques.pdfIn PDF document text
    • http://dawavuwera.22web.org/invitation_maker_free_template.pdfIn PDF document text
    • http://larebalin.mypressonline.com/wivikuneligaludotumowum.pdfIn PDF document text
    • http://fimajixilozile.22web.org/71441405083.pdfIn PDF document text
    • https://cdn.sqhk.co/vefoxewijuja/gw6Xijh/60933410551.pdfIn PDF document text
    • https://cdn.sqhk.co/vumorumuvogi/yeifGln/sewiwuj.pdfIn PDF document text
    • http://fojolosu.iblogger.org/chemistry_lab_report_cover_page_template.pdfIn PDF document text
    • http://famozosivupiwij.sportsontheweb.net/61196912434.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kimone/kruskal_s_algorithm_questions_and_answers.pdfIn PDF document text
    • https://49550882-97ce-44db-a38b-6e383bb81149.filesusr.com/ugd/062c90_858dd1272de64bb3965ca34112aeeb49.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pizexopenaxu/petuvevigapumiwub.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/dejunotin.pdfIn PDF document text
    • https://s3.amazonaws.com/mosezavor/yealink_dect_w52p_user_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/wunojipu/89420233494.pdfIn PDF document text
    • https://s3.amazonaws.com/sasufufa/wizard_of_oz.pdfIn PDF document text
    • https://71bfc0c6-4bef-405a-aee6-9e9dcaab3d12.filesusr.com/ugd/708cfd_041e2538001040f5b29eabdae99def8c.pdf?index=trueIn PDF document text
    • http://vilatelisoto.onlinewebshop.net/fender_gb_hot_rod_deluxe_112_enclosure.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_off00013f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F1B 5280 bytes
SHA-256: 278d42ab4f1743d9efc1c7d9c30c20878d5ee05ff91c450d277f00044cd18964
font_01_sfnt_off00015139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15139 10520 bytes
SHA-256: 5fbfe1f47951752e490965ac5f66859df3605c9b2917bb23ea3a290ca12106b3

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