Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ca03d16ed626d06…

MALICIOUS

PDF

65.3 KB Created: 2021-03-07 09:55:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 67c58f504a7cbe8241922856d2fe6a5c SHA-1: 19101186e3ccfcba16dd59eefb719160df9fcfa4 SHA-256: 4ca03d16ed626d0644c4906cf1fa908bd4008413f7f70d5e53cf4e3ceab828b7
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or redirector services, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

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 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://leonvi.ru/strik?utm_term=introduction+to+elementary+particles+2nd+edition PDF link annotation
    • https://zogininofifus.weebly.com/uploads/1/3/2/6/132695288/d2cc0d937f.pdfIn PDF document text
    • https://cdn.sqhk.co/zogaxokeno/ighaDOt/jefufanol.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/frigidaire_refrigerator_fgus2632le0_parts_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/jjjbihu/stencil_art_spray_masters_app.pdfIn PDF document text
    • http://vabuzunaseridal.iblogger.org/lawenurofizebenelisarebo.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/windows_10_missing_performance_power_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/suwapipejob/ghgcjbt/65401743120.pdfIn PDF document text
    • https://filofasifujutoz.weebly.com/uploads/1/3/0/8/130874575/banesapigux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bumurulepowele.myartsonline.com/how_to_fix_whirlpool_washer_leaking.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/36293828.pdfIn PDF document text
    • http://dokudaruriwiv.atwebpages.com/scag_tiger_cat_drive_belt_diagram.pdfIn PDF document text
    • http://birukuf.onlinewebshop.net/watch_the_white_princess_episode_7_online_free.pdfIn PDF document text
    • https://b6c9d0de-81a1-4db9-ab7d-8a95af9e63d6.filesusr.com/ugd/b28ae2_936997f54ae449f192874dcc593faed7.pdf?index=trueIn PDF document text
    • http://xezepagonozaniw.epizy.com/que_es_biomagnetismo.pdfIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_39c97838d0534c7dac0e0e092e841799.pdf?index=trueIn 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_off0000c2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2F2 5392 bytes
SHA-256: 78d4b81fd5b5fa86ae9c20096e92e7c626364b85e6f969817ba0055dee473622
font_01_sfnt_off0000d535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD535 10232 bytes
SHA-256: cc555d8940ac47b5812f7b957424cbf8d132b8b80d7645d2cabc7b1f8109ac56

Open this report in the interactive analyzer, or submit your own file for analysis.