Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c8b66658ef9d92e…

MALICIOUS

PDF

76.5 KB Created: 2021-01-25 19:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0c5ecd92495ce54b682e71113b46225b SHA-1: 9cde47fa64a207c814e673136b0900ca8a1832b8 SHA-256: 0c8b66658ef9d92eade49d7045a5b62ac47740d639941f9df165c222f3c11de2
116 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, where the user is prompted to call a fraudulent number. The presence of embedded URLs, such as https://seumenha.ru/aws?utm_term=exterior+angles+of+polygon+worksheet, further supports the phishing nature of this document, likely used as a lure to initiate contact.

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
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://seumenha.ru/aws?utm_term=exterior+angles+of+polygon+worksheet PDF link annotation
    • https://cdn.sqhk.co/murefazomejo/bsCd4ih/movie_catalogue_app.pdfIn PDF document text
    • https://cdn.sqhk.co/muruwake/hGhghfZ/satojorimobojugemafa.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/b4jajak/dora_saves_the_crystal_kingdom_wii_game.pdfIn PDF document text
    • https://cdn.sqhk.co/julukiporo/ifntCja/78599033581.pdfIn PDF document text
    • http://jesofafisozosa.iblogger.org/indirect_function_excel_different_sheet_example.pdfIn PDF document text
    • https://cdn.sqhk.co/duvapegoleva/geIjifM/4runner_towing_capacity_v8.pdfIn PDF document text
    • https://cdn.sqhk.co/vijukifezu/cDhgGjd/33814019717.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe420c2e6ac0.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/ijggjaF/neon_green_snake_print_heels.pdfIn PDF document text
    • https://cdn.sqhk.co/wuxaguzifep/99hc2nr/76666248569.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wurivuve/44983599068.pdfIn PDF document text
    • https://s3.amazonaws.com/midipes/acinetobacter_lwoffii.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/a2_accounting_osborne_books_answers.pdfIn PDF document text
    • http://kifemulawej.epizy.com/nintendo_switch_arcade_cabinet_template.pdfIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/xitinowowon.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/free_printable_science_worksheets_for_elementary_students.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/34619327631.pdfIn PDF document text
    • http://dunixojojulif.epizy.com/resume_letter_sample.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/livro_avivamento.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD589 5448 bytes
SHA-256: 58c5e42fb6f7809038c90c44766a436a14cf709b2da4d82d1fd8f0725ade1860
font_01_sfnt_off0000e833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE833 11172 bytes
SHA-256: 242512ce132f366825d77ee71a3ec7a4ce7150cc1957652a271f488a201bdd65
font_02_sfnt_off00010ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EAD 16152 bytes
SHA-256: 70180b97a9b9fe0de1e0c05b06d733d04658c9f7a2923a3eee6842afe753d47e

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