Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6d419d0d1a90db…

MALICIOUS

PDF

78.3 KB Created: 2021-03-10 21:06:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: d92f1bbe236d0ec3c1b6b4bceae961b9 SHA-1: d32d0004188bf093f461e9dc39fc5b715db52a06 SHA-256: 4e6d419d0d1a90db5f45aa2636202ab9a3a480bfd027b71461ef63bc80056cb3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains a mass of external links, many pointing to SEO-optimized PDFs, and a redirector URL designed to trick users into downloading potentially malicious software. The presence of a visual download button further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/strik?utm_term=letasoft+sound+booster+1.11+activation+key PDF link annotation
    • https://jatilesaza.weebly.com/uploads/1/3/4/3/134316516/ropazofavatis-tatexopuxu-fimudes.pdfIn PDF document text
    • https://likufuzojelawaf.weebly.com/uploads/1/3/5/2/135298946/8956734.pdfIn PDF document text
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/xolik_kewepelig.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/99c3170125ebc79.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/904db383-27c8-4abe-89a9-abae4444d234/what_text_structure_does_the_author_use_in_the_underlined_section_of_the_excerpt.pdfIn PDF document text
    • https://s3.amazonaws.com/jagux/52147687644.pdfIn PDF document text
    • https://s3.amazonaws.com/nupotukig/adaalat_tv_serial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfaaafb1-2df8-4a64-9643-b35917ab8b5d/technical_oral_communication_definition_in_simple_words.pdfIn PDF document text
    • https://s3.amazonaws.com/gurafoga/68606446055.pdfIn PDF document text
    • https://s3.amazonaws.com/bogeguva/91993679554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a17c48e-2d65-4526-a7a4-f15ae89734a1/joxinoluxoreguxoduxapefo.pdfIn PDF document text
    • https://s3.amazonaws.com/garorowa/will_amazon_fire_have_hbo_max.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/rokepa.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/kotugulebal.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/tanejipigikaxapumaz.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/bioscience_reports_publication_fee.pdfIn PDF document text
    • https://s3.amazonaws.com/rotowan/minecraft_pe_lucky_block_mod_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead40286-f0c9-4f3f-a9a2-3dc1d127f643/datamax_dmx-i-4208_printhead.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifawuvawot/badopiliwemafajixo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c48097bc-7add-4852-8509-8a8c52f340f7/fedefimowo.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/84694041716.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_off0000f5a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A9 5376 bytes
SHA-256: bd9281856061c460226729f5403cc534098208f84e9f5616b0d03f9967920a49
font_01_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10544 bytes
SHA-256: 08924af2930e8d3732fb3c42c2ea8b2420a06d76a3969c67242bd43fbf73a5cf