Malicious PDF — malware analysis report

Static analysis result for SHA-256 745c79857f1cabe0…

MALICIOUS

PDF

75.8 KB Created: 2021-02-25 00:06:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: cd1f62439e8267149b4b816474c0b8eb SHA-1: 525de4e79cb17293fa0d622909fdec4816ab197a SHA-256: 745c79857f1cabe022ec821f47e235956d5362f7609303ed0ae57cdd9bce00c6
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/wix?keyword=cedar+rock+park+trail+map PDF link annotation
    • http://xulubapatoso.scienceontheweb.net/jezaraxupimegonadotu.pdfIn PDF document text
    • http://zawugudumi.getenjoyment.net/which_stock_broker_is_best_in_malaysia.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/9034785244.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475197/normal_6006e22bf154b.pdfIn PDF document text
    • http://movawizaxaxato.mywebcommunity.org/59333583856.pdfIn PDF document text
    • http://nikomodemudajo.iblogger.org/43628421398.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/jvc_digital_video_camera_gr-d340ek_charger.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://jufebiwewizeza.rf.gd/leave_application_form_word_template.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/14772833722.pdfIn PDF document text
    • http://retelowanudugut.epizy.com/fishing_guide_school_california.pdfIn PDF document text
    • https://s3.amazonaws.com/panokojol/build_a_pro_forma_balance_sheet.pdfIn PDF document text
    • http://gudinomid.rf.gd/where_to_watch_pippi_longstocking_movie_online.pdfIn PDF document text
    • https://s3.amazonaws.com/gotijejaj/waretufopozutojutin.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE14E 4808 bytes
SHA-256: 80109e1a3e38ec80f25395cf670cab16ab6544b31216c95c452914fd83dc4992
font_01_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 9964 bytes
SHA-256: ca016406560387351c81ad1383b3930c00f6b6626cdf60dd8dba114e6df385e9
font_02_sfnt_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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