Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57cfc9beb73bafd…

MALICIOUS

PDF

84.4 KB Created: 2021-01-20 22:09:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9fe26233a72efcf844fdccdf74e39145 SHA-1: 976921ef54aa7b13277149dfde34a235b17578b1 SHA-256: c57cfc9beb73bafd5612c762e548887b1b1703c6f929c0c058fd3e371ab4fc1e
184 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical alert for linking to known malicious redirector infrastructure. The embedded links, such as 'https://traffine.ru/123?utm_term=el+poder+positivo+del+pensamiento+negativo+pdf+gratis', are designed to lead users to potentially harmful websites. The document's structure and embedded URLs suggest a phishing or scam attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://traffine.ru/123?utm_term=el+poder+positivo+del+pensamiento+negativo+pdf+gratis In PDF document text
    • https://site-1174866.mozfiles.com/files/1174866/20594218228.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425737/normal_5fcb11b14e252.pdfIn PDF document text
    • https://site-1189736.mozfiles.com/files/1189736/jatelobigavafipatus.pdfIn PDF document text
    • https://site-1168325.mozfiles.com/files/1168325/weed_farmer_overgrown_apk_license.pdfIn PDF document text
    • https://site-1172884.mozfiles.com/files/1172884/93386974533.pdfIn PDF document text
    • https://site-1180756.mozfiles.com/files/1180756/descargar_lokicraft_2_apk.pdfIn PDF document text
    • http://mivetofim.22web.org/14390141153.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/2392097869.pdfIn PDF document text
    • https://site-1193774.mozfiles.com/files/1193774/baixar_anime_land_apk.pdfIn PDF document text
    • https://site-1174383.mozfiles.com/files/1174383/sutow.pdfIn PDF document text
    • https://site-1168332.mozfiles.com/files/1168332/puror.pdfIn PDF document text
    • http://bofinaposo.iblogger.org/sentence_error_correction_exercises_with_answers.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/bagisi/kegugafofosedesu.pdfIn PDF document text
    • http://zivuneko.epizy.com/fifap.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/bwv_1067_piano_sheet.pdfIn PDF document text
    • http://sabinozugi.epizy.com/galactic_civilizations_3_guide_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/50269176967.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_off0000fb62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB62 5380 bytes
SHA-256: bdd85103029b7c3d3a7a04c85b54944bb0c4941e320314ffc0047353a8fe5258
font_01_sfnt_off00010da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA1 16876 bytes
SHA-256: 5e765539d08b3b294cb95bc3160abfa2299d15d460fb81bc0d2fb08cced39b03