Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09862b64859e409…

MALICIOUS

PDF

71.2 KB Created: 2021-03-02 14:37:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 37427ce5a960ff5177a12a078cb88702 SHA-1: 4fa491cc47f8e1f61006262619ca102173c8c4a9 SHA-256: d09862b64859e409f2d07746aa4381c28276a2b8a01b330fd2c1abd84375ceee
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It functions as a link farm, embedding numerous URLs that redirect to other PDF files, likely to obscure the final malicious destination. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://nipisod.ru/strik?utm_term=margaritaville+drink+machine+manual PDF link annotation
    • http://realnoe-obshenie.online/xanevafuxaxejajuseko24w.pdfIn PDF document text
    • https://zududebagulakes.weebly.com/uploads/1/3/3/9/133997448/fafexizu.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/51275952251.pdfIn PDF document text
    • https://tuxipowu.weebly.com/uploads/1/3/4/6/134699968/rexadifuponogunufum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383304/normal_5fdcf73bd4e6b.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/what_is_civil_religion_in_sociology.pdfIn PDF document text
    • https://wavoxodasamemat.weebly.com/uploads/1/3/5/3/135348105/welagasofuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392444/normal_5ff50f2776121.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450439/normal_602156a14309e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367938/normal_6025eae8391c4.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/ih8roQL/paint_by_numbers_creator_dies.pdfIn PDF document text
    • https://cdn.sqhk.co/susononuz/heMVhjL/clockify_app_server_error.pdfIn PDF document text
    • https://cdn.sqhk.co/rudolikube/iDgc0jb/bemewolapusab.pdfIn PDF document text
    • http://vir-tus.com/merchant_of_venice_workbook_answers_act_2_scene_9x6gwi.pdfIn PDF document text
    • http://lisolu.org/78013861624ljmwh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5fc8a8fc1d02b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459645/normal_5fe4b490e3390.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jisijuvod.myartsonline.com/how_to_bar_a_soldier_from_reenlistment.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_off0000d6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D5 5304 bytes
SHA-256: cfd8496a04eee0a0f411f7d70c29bdabedaa493f435ead981a7fdc2c43d00249
font_01_sfnt_off0000e8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C8 10760 bytes
SHA-256: 8b9ef712b688e0c298679b7c951a8162a03c4dc8fc03312c345aef86791d7c59

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