Malicious PDF — malware analysis report

Static analysis result for SHA-256 661c5d20c9e5ad59…

MALICIOUS

PDF

76.9 KB Created: 2021-03-09 12:08:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d110bd40c9de16ad8418e932ad2d8b31 SHA-1: 91cf7123d5248de8d6a09c942450bcdc62946bd8 SHA-256: 661c5d20c9e5ad59ae7663b8eef23f63b601fa3f59ec8b9b0d0aa2f42b50dceb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/strik?utm_term=m-audio+axiom+49+mk2+manual PDF link annotation
    • https://fuvapevamasazu.weebly.com/uploads/1/3/4/5/134507747/bejixif.pdfIn PDF document text
    • https://cdn.sqhk.co/rifokinimito/VhbgZFK/battlefield_companion_pc_descargar_gratis_espanol.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/vexukisafajodez.pdfIn PDF document text
    • https://cdn.sqhk.co/tajixixejafi/OGqhbmQ/amiibo_mario_kart_8_suits.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hmG5U89/roxulukikatizux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4504047/normal_60354fd7d4975.pdfIn PDF document text
    • http://rasezatoxefu.mygamesonline.org/pride_and_prejudice_2005.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/6424504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492575/normal_5fe6624737083.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_603363f4740a1.pdfIn PDF document text
    • https://lipemegovaw.weebly.com/uploads/1/3/4/7/134766771/d692922a8d380.pdfIn PDF document text
    • https://zukodefikarux.weebly.com/uploads/1/3/4/4/134498552/xasutabok.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/vetamedisoz/afl_fixtures_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vanatul/vurusoxikorilaful.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/84059054947.pdfIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/powerpoint_presentation_templates_machinery.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/xuretomeketofaz.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/55332488745.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/back-_ups_pro_1000_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/rimotirorifumunudi.pdfIn PDF document text
    • https://s3.amazonaws.com/bokexizometun/pofumoxiduzegijamule.pdfIn PDF document text
    • https://s3.amazonaws.com/xidazeze/ice_fishing_guide_kenora_ontario.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_off0000ec0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0F 5244 bytes
SHA-256: d97d0a48f065a8c7ad80dae614338a3cf1a123f7949b46af4129fdacd648e34f
font_01_sfnt_off0000fdfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFB 11464 bytes
SHA-256: 06c3f72bc2bfc4bb73c4b4ff82623fb65f5f306507dc41128143f79226822023

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