Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb9db88bb20eef9…

MALICIOUS

PDF

72.1 KB Created: 2021-01-22 14:50:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8568faf88b828ab63ff7903463d58c85 SHA-1: 16f100848fab1e78129c1fbb87e606c750fd72f7 SHA-256: 1eb9db88bb20eef9feeb7a854479ae8b0b555768a6d2ec748e1df1646f3d479b
154 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://crophysi.ru/123?utm_term=45+ways+to+avoid+using+the+word+very'. This URL is the primary indicator of malicious intent. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of a malicious URL within a PDF document strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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://crophysi.ru/123?utm_term=45+ways+to+avoid+using+the+word+very In PDF document text
    • https://static.s123-cdn-static.com/uploads/4411916/normal_5fc97a7405563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fe83e81d18ee.pdfIn PDF document text
    • https://cdn.sqhk.co/wutalididow/haH0jaA/cross_stitching_fabric_count.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454168/normal_5fe4b28ce2d24.pdfIn PDF document text
    • https://site-1178035.mozfiles.com/files/1178035/xofekexobaluwamunofet.pdfIn PDF document text
    • https://cdn.sqhk.co/tumosirewuw/Gh1Nhih/three_kingdoms_epic_war_heroes.pdfIn PDF document text
    • https://site-1257486.mozfiles.com/files/1257486/venezuela_fact_sheet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365547/normal_6009c3e0cad44.pdfIn PDF document text
    • https://site-1210646.mozfiles.com/files/1210646/dr_driving_2_game_download_for_laptop.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/dojonuta/beowulf_modern_english_translation.pdfIn PDF document text
    • https://s3.amazonaws.com/taturi/51915409655.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/vobosid.pdfIn PDF document text
    • https://s3.amazonaws.com/metakibeme/browser_automatically_opens_website_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/air_transat_flight_status_information.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/intermolecular_forces_liquids_and_solids_worksheet.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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 5428 bytes
SHA-256: c7f300926d5419818b4fc5bfc45022a0146f041a27e9517d52d8c961137c45a2
font_01_sfnt_off0000edd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD6 10776 bytes
SHA-256: 1e1427df3c18ef8769f0e09945d6c9eb52efa8b0785af73e0bbccd5ed3b066a1

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