Malicious PDF — malware analysis report

Static analysis result for SHA-256 361c8484bd5bde8c…

MALICIOUS

PDF

76.4 KB Created: 2021-04-06 07:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 2d20acb31d1000741d031e10e28bc954 SHA-1: 2aeab23cf6fce2b16aaf7cb738eb55f7d2b94a3c SHA-256: 361c8484bd5bde8c762d3689beac52592a788a2f2051a6aaa52831ab4be697c0
214 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 finding for a link to known malicious redirector infrastructure. The document contains a large number of embedded links, suggesting a phishing or link-farming attempt. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly indicate an attempt to redirect users to malicious sites.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=black+and+decker+8+cup+rice+cooker+manual In PDF document text
    • https://gejuvidafi.weebly.com/uploads/1/3/4/4/134456396/1360120.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/6150415.pdfIn PDF document text
    • https://ziwarojuwetupo.weebly.com/uploads/1/3/4/3/134343479/dobege.pdfIn PDF document text
    • https://loleritukala.weebly.com/uploads/1/3/0/9/130969936/fozovojax.pdfIn PDF document text
    • https://waperimawomexav.weebly.com/uploads/1/3/4/7/134733778/burotejew-zisifu-fanetojebuv-girefufipes.pdfIn PDF document text
    • https://zutafagufagupak.weebly.com/uploads/1/3/4/2/134235067/fatepaxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c896d37-30d1-4b4d-9537-98f963aae812.filesusr.com/ugd/865d50_7585473441b64186bcae2c685ad36dfc.pdf?index=trueIn PDF document text
    • http://sibexelopuni.epizy.com/laser_cut_extruded_acrylic_sheet.pdfIn PDF document text
    • https://6525eaf8-9a42-4119-9fb4-c3d475b3b78e.filesusr.com/ugd/80bfa9_91f7bd6311414158b6a1594320cbc836.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuxagixil/zoomer_cat_for_sale_glasgow.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/dbt_skills_list.pdfIn PDF document text
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_f7eba281b98041b8b103424ff386d339.pdf?index=trueIn PDF document text
    • http://xajokaxakubif.rf.gd/penosovuje.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/88116807355.pdfIn PDF document text
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_a2950909203b4420b4bdeb12389f50d9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/xaruwesusesu.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_off0000ec4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4B 5348 bytes
SHA-256: f8413df52bfa80e50a785eef2c116a805d62f28c9fb6c974bb59620f649bc967
font_01_sfnt_off0000fe67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE67 11016 bytes
SHA-256: 2512483f34b27afa8599118f983c211a5bf0df0f020f707b44ece585d4bede60

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