Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c900473dc81f851…

MALICIOUS

PDF

88.8 KB Created: 2021-03-25 08:49:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5401480e78cc06b2a7d36946cb8e7bd9 SHA-1: 7ad1474211902570fb0878cf1cd201d698fc1169 SHA-256: 7c900473dc81f85158bd137ba6d1d85e7861c6007ac81e5113028a68bf7bd99e
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that mimics a search result for 'del norte county jail inmate list', likely intended to trick the user into clicking it. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URI suggest a phishing lure designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=del+norte+county+jail+inmate+list
    • https://static.s123-cdn-static.com/uploads/4411246/normal_5fced0b662cb9.pdf
    • https://cdn-cms.f-static.net/uploads/4486758/normal_5fda74adcb214.pdf
    • http://japancar-sib.ru/wagubovapapojuvomglni9.pdf
    • http://ppl-nutrshopfit.website/what_is_the_difference_between_soa_service_oriented_architecture_and_cloud_computinggud1u.pdf
    • http://crispyset.online/how_much_does_an_engineering_manager_make_ukskepn.pdf
    • http://theplafond.xyz/books_by_john_norman3034c.pdf
    • http://delaem-sami.online/codigos_canales_privados_rokup03u4.pdf
    • https://cdn-cms.f-static.net/uploads/4413012/normal_6041443c6f362.pdf
    • http://bigtittybella.com/how_to_replace_logitech_mouse_receiverf2cfe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://013c3ecd-17dd-4738-ad87-554153c764a5.filesusr.com/ugd/36f25b_2342f4f0d565496fa38639efdc9d8dd6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/beae4cac-2487-47f4-b2f8-879946638393/76210740417.pdf
    • https://9d3edb37-11ce-4d87-b861-4f8d850d55a0.filesusr.com/ugd/0d2aa0_db24f6adc12342e0b0c08bf91d73aae5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/55bdf59b-e36a-425c-bed2-8f4d42d897c3/descargar_biblia_reina_valera_1960_gratis_en_espaol_sin_internet.pdf
    • https://s3.amazonaws.com/padanivozeb/bukaruxaluxodu.pdf
    • https://s3.amazonaws.com/mubefula/setajemokujo.pdf
    • https://uploads.strikinglycdn.com/files/8f3efa84-9926-4b8e-8819-1918b5ea335a/93254602714.pdf
    • https://uploads.strikinglycdn.com/files/29b1deff-ea47-4e75-912e-85732d52f250/xamazesodamu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c6f.bin
cf2e2fd1de51a64fc275c01b8c2cae888ca15e6b78fd079883c12b8ed4278b6e
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C6F 5124 bytes
font_01_sfnt_off00012dd7.bin
9b0f48f6b1b42cba33b6d179ffc12aba1e4f318d0cdac51804ca555182d863cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x12DD7 11832 bytes