Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5ccb828a916e8eb…

MALICIOUS

PDF

76.8 KB Created: 2021-03-19 04:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 1394713cff60db49e2d5c204124a1985 SHA-1: 2a32c45a90ad37205e2e58845f904e734fbb10da SHA-256: b5ccb828a916e8ebcfb41af91aefd559299e3fe6247694fac22950b6873dcc13
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://xezojetit.ru/123?utm_term=formal+letter+asking+for+a+job+example PDF link annotation
    • http://zoradiwa.iblogger.org/azure_striker_gunvolt_3ds_rom.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/best_interview_questions_and_answers_for_freshers.pdfIn PDF document text
    • https://cdn.sqhk.co/nosimasiv/niedda6/78853026980.pdfIn PDF document text
    • http://pamuxixa.iblogger.org/perotur.pdfIn PDF document text
    • http://finuxezanasa.mygamesonline.org/7616754880.pdfIn PDF document text
    • http://xamawigokoke.mygamesonline.org/fusionner_deux_documents_avec_aperu.pdfIn PDF document text
    • http://rudovatimokasum.medianewsonline.com/dibijodimimominat.pdfIn PDF document text
    • http://xuforixek.22web.org/critical_ops_hack_apk_1._2._0.pdfIn PDF document text
    • http://vukufitu.mywebcommunity.org/quran_with_urdu_translation_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/jufulezamuko/ZyxmjMw/rolling_stones_logo_transparent.pdfIn PDF document text
    • http://gutagige.sportsontheweb.net/sql_server_2020_cluster_installation_step_by_step.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/wadebofipuv.pdfIn PDF document text
    • http://dabedera.mygamesonline.org/aachar_sanhita_2020_rules.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/what_is_another_term_for_informal_language.pdfIn PDF document text
    • http://tasunixupowife.66ghz.com/cambridge_pet_speaking_exam_samples.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b34384f4-81ff-4332-89de-7b318f0d0f32/how_to_bake_cake_in_haier_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bb58a98-344f-40e6-bdec-7f485fd9cbc9/marla_maples_news_today.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/consejo_escolar_de_participacion_social_sedu_coahuila.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d17f4f7-41e4-4c10-9b26-76c8ba56ea3f/how_long_is_the_2_harry_potter_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3b08fd3-6403-4a71-b529-642759a73899/vodolawutijog.pdfIn PDF document text
    • http://pejenusiloxo.rf.gd/cervix_anatomy.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0d25c7f-11f8-452c-8b41-a34579290d91/43788421923.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_off0000ef2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2A 5524 bytes
SHA-256: b8e7721d65c9bd1c54f2139b1ee51192f2a3a9035df70c9ef0ed479798699f5f
font_01_sfnt_off000101e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E8 10648 bytes
SHA-256: 156f2839b46b7f9c4ae5b40a42def19c3b164d9bf34381b1d2ce15af7d943d0e

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