Malicious PDF — malware analysis report

Static analysis result for SHA-256 08fd5b7bd6562681…

MALICIOUS

PDF

78.3 KB Created: 2021-03-15 23:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 316e9e5b014297538a6f2fcb96a9ec1d SHA-1: 20e83a48a01b1700daa23bdc545438ce86b34e49 SHA-256: 08fd5b7bd6562681a73e18651260983bb93ffdbd7a781ea77df4ae63d2780da0
126 Risk Score

Malware Insights

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

The sample was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://xajibur.ru/strik?utm_term=how+much+room+for+a+shuffleboard+table PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484609/normal_6020fd17c6a98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417408/normal_6035975d51199.pdfIn PDF document text
    • https://cdn.sqhk.co/dutimapo/N1lhija/brick_breaker_world_champion_mod_apk.pdfIn PDF document text
    • http://mojadejazisapa.sportsontheweb.net/bankruptcy_act_1869.pdfIn PDF document text
    • https://cdn.sqhk.co/jubawiwa/jct9yWu/best_tamil_rhymes_video_songs_download.pdfIn PDF document text
    • http://kazexajisodibu.medianewsonline.com/catalog_toto_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/jdU08ia/40242068752.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389097/normal_602531c3e6d93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483075/normal_60037ad7ecd76.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450896/normal_602189c852a7f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e7f45dcf-1957-410e-85b1-216e85a225c4.filesusr.com/ugd/a2c2bc_0d8f29196a3f41a490ef1cba962c30af.pdf?index=trueIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_1abe684e07ff4028ad4588f26abdc0de.pdf?index=trueIn PDF document text
    • http://gozudil.onlinewebshop.net/the_things_they_carried_test_answer_key.pdfIn PDF document text
    • http://lopafulobitap.atwebpages.com/35168060542.pdfIn PDF document text
    • https://836291d8-7b77-40db-be8c-3105928c7ef3.filesusr.com/ugd/aae074_bc9643a81a1e4471935c1affc63027a2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/faxaxos/biology_book_in_bengali.pdfIn PDF document text
    • https://f579be4a-c2ec-451d-94ee-532237c06880.filesusr.com/ugd/9f6a24_6b1b6438c6c84df7ad1502bf2db8e835.pdf?index=trueIn PDF document text
    • https://5f384421-c3d0-4b4c-85a6-d3745974446f.filesusr.com/ugd/40006b_c7d945a6c8a847ce8d7457d6e7a1d41b.pdf?index=trueIn PDF document text
    • https://e25b5f36-ee09-4010-8803-019b2853a23b.filesusr.com/ugd/c34eac_67a842debf704bacb963f00462a6ae94.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/timituvupame/match_analog_clock_to_digital_clock-_worksheet.pdfIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_93a0faeab4ed409f88abb1cb3560da76.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rodakarugupoko/famous_guitar_songs_sheet_music.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_off0000f4d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D1 5452 bytes
SHA-256: 855aa27fdcb25cc45b98cd704257df2f2222c85d28f9d105422e2cd3be6ed4eb
font_01_sfnt_off0001073a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073A 10676 bytes
SHA-256: c23d4a9b162205bcfbd959ecebdda5b8590b7795f834a36e09860e8793245012

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