Malicious PDF — malware analysis report

Static analysis result for SHA-256 a736720fe1f02b54…

MALICIOUS

PDF

78.5 KB Created: 2021-03-17 06:13:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 5e02d6b15e6fb85ae9a730e8f28d2425 SHA-1: 3d35f22a339b77679c771230f2b947952f4e51fc SHA-256: a736720fe1f02b54b0003c8559a5f4a53c84758cd9c2a1cef8247c2117f6ba36
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness, specifically as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to potentially harmful sites, aligning with a phishing or content-luring attack pattern.

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://druttle.ru/award?keyword=fitness+boot+camp+workouts+pdf PDF link annotation
    • http://lusejifunod.22web.org/scrum_master_certification_exam_questions_and_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460463/normal_604f4650f1531.pdfIn PDF document text
    • http://zukoretevir.medianewsonline.com/gijese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467005/normal_60295d639c400.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5fc72733dfd09.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408703/normal_5fdfd15f79fde.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486354/normal_5ff25d042d4d7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikefibuji.rf.gd/fedibexebibitawe.pdfIn PDF document text
    • https://s3.amazonaws.com/fomaralunex/basanti_movie_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/ligole/79968319401.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/usmle_rx_first_aid_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/language_arts_worksheets_grade_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wiremeresegikon/todegobo.pdfIn PDF document text
    • https://c0e8410b-c394-4b36-8083-179878a46647.filesusr.com/ugd/d4b1dc_a49bd01654384e07a8f2a0dc9d03c3b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gajakelegeza/27793832901.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_e7bc787011714a118b3a555d1e984c6f.pdf?index=trueIn PDF document text
    • http://nejesezape.myartsonline.com/mojemi.pdfIn PDF document text
    • https://s3.amazonaws.com/gowebabuxogiro/calling_card_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sutawowirosuvuv/solidworks_installation_manager_problem.pdfIn PDF document text
    • http://fazafowunop.epizy.com/22700719327.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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5520 bytes
SHA-256: 897af45bfaa08e87af6ac1d9f099f048fc30eab1f602741063ce82399e03445b
font_01_sfnt_off0001077c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077C 11092 bytes
SHA-256: c8732383f9992a5695720b42b56b6f92d194e735390ceca159fe1347727bf755

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