Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6aefbb1d750658d…

MALICIOUS

PDF

91.6 KB Created: 2021-05-22 19:22:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 76e79b0028b83ba10ca79fc9da54f78d SHA-1: 99abc8e755eb62bee91ee74023a16b192f0ee10e SHA-256: a6aefbb1d750658da7f7bf7f4199f79a4c417b42cacf121d49b321679f8b977c
262 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are likely part of a link farm designed to improve search engine rankings for terms like 'rar password recovery'. One critical heuristic indicates a link to known malicious redirector infrastructure. The document also employs a lure related to password-protected archives, suggesting it aims to trick users into downloading potentially malicious files. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=rar+password+recovery+5.0+free+download+full+version In PDF document text
    • https://bakubirusi.weebly.com/uploads/1/3/4/6/134680497/7987280.pdfIn PDF document text
    • https://lozuninusagutog.weebly.com/uploads/1/3/5/3/135309735/7797647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_6059c086e6c53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493221/normal_6035458ea341a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477626/normal_5fd2fabaa06e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409604/normal_5ff4c649b6e30.pdfIn PDF document text
    • https://sofamilases.weebly.com/uploads/1/3/5/4/135401016/de962022f8b7.pdfIn PDF document text
    • https://pesawuzopedeg.weebly.com/uploads/1/3/5/3/135327269/togozatusokofu_pilinisuvosi_fasak_fuwatotopon.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444882/normal_5ff24bad41cb0.pdfIn PDF document text
    • https://dewosuto.weebly.com/uploads/1/3/1/4/131453399/bidowisu-nesufofepesowo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381737/normal_5ffb1795be600.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454984/normal_6017984f40d7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385863/normal_6012e6b7e9021.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/mejobu/ski_doo_ownership.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d3b6473-e021-4b6e-883a-6dea9aa4e191/norog.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/bissell_pet_carpet_cleaner_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/120e4304-d8ac-4677-86b6-d77ffce8be4d/44928944082.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/anthasthulu_old_telugu_movie_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/barcelona_vs_villarreal_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/mujosoja.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/agenda_2030_para_el_desarrollo_sostenible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c8fa70d-442a-4b5e-b4b4-269b0e55fd08/daruzifavuj.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_off00010491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10491 5708 bytes
SHA-256: f097be0482a49bd0facf6a1e30a398f48ade5e9d62b710b9c75cbaeda785d3f2
font_01_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 18616 bytes
SHA-256: da6d0992f872b172dd9870907f33d80b882e8b19ab49ade6bbbee8bf6c659dd9
font_02_sfnt_off0001485e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1485E 16400 bytes
SHA-256: 44f9fd5195cf255265141daa3116ced55768786d3392a002edcbd73ee4379139