Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1d37661e7e27617…

MALICIOUS

PDF

76.4 KB Created: 2021-02-16 11:45:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 49d709a8ee190181ccce4370e1d533ac SHA-1: 0a791d1ed2ebc6c5402a156727e0567ebd729bf6 SHA-256: d1d37661e7e27617ba89d17ae0b1bf0f156992f22af5c1eacfb188987d75fd1b
126 Risk Score

Malware Insights

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

The PDF document contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a spearphishing attachment used to redirect users to malicious sites.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 http://amorexpo.com/vupulebetizonas02e16.pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4369187/normal_6008275522411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379744/normal_5fea21babc988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fce30b4c7816.pdfIn PDF document text
    • http://soldonlittleton.com/97379262743dtrge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366015/normal_600b126565de1.pdfIn PDF document text
    • http://frankiearvelo.com/12_week_year_study_guide_download21fx3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383695/normal_60235faabc0af.pdfIn PDF document text
    • http://remontnatali.ru/www_bogglesworldesl_com_2006_skeletal_system_crossword_answersto22t.pdfIn PDF document text
    • https://druttle.ru/wb?keyword=the%20best%20of%20queen%20PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tesoduv.rf.gd/farming_simulator_18_apk_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/how_to_answer_law_exam_problem_questions.pdfIn PDF document text
    • http://dinixikidimed.epizy.com/ipcc_special_report_october_8_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/tarobekaxatinozupunaser.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD677 5956 bytes
SHA-256: 293d1b640ebe34f022d86e8b3e8fd034be98c177d966b735983a9bdee6f4a07c
font_01_sfnt_off0000eab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB0 10428 bytes
SHA-256: f5ba6eaf29f8bc554ddd4edb70a3c6e40418e47b15419304bb6c85d0b695522c
font_02_sfnt_off00010ea3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA3 16100 bytes
SHA-256: b330339415d7fa9c1b652c1fb2a052ec06569061b7b71506ab53161dc9b94742

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