Malicious PDF — malware analysis report

Static analysis result for SHA-256 bde57c5a94d655a3…

MALICIOUS

PDF

77.9 KB Created: 2021-03-11 00:41:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: efdf3ff69632c26326f6b26d7de9b63b SHA-1: 9a5ca34470586dcd37b411b792246a7abf6bb02f SHA-256: bde57c5a94d655a3480aa5a190588a318254f061141a00cff0f90d597e4b675d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and potentially malicious domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO spam campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://bologen.ru/wix?keyword=tank.io+game+unblocked PDF link annotation
    • http://mapotilij.mygamesonline.org/22952052468.pdfIn PDF document text
    • https://cdn.sqhk.co/bexutavukaro/bgggiii/fiminopakofodo.pdfIn PDF document text
    • https://cdn.sqhk.co/tusenepobam/9haTKyi/38251621260.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/50146688824.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/pSIihic/rpg_game_maker_vx.pdfIn PDF document text
    • https://cdn.sqhk.co/tititafoza/3gchepd/79211295727.pdfIn PDF document text
    • http://xujimutisep.iblogger.org/new_wave_tv_channel_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/fokofike/jhqDTjh/93781408857.pdfIn PDF document text
    • http://monogawuw.iblogger.org/3553517194.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/rebesudanolo/hollywood_movies_in_tamil_dubbed_full.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1fe33c5-9efb-4205-a3ba-842c66464529/seven_lakota_values.pdfIn PDF document text
    • http://tagijonegularol.myartsonline.com/bash_script_variable_scope_function.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/the_circadian_code.pdfIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_32f8397e452b4c0aa0fd89c13fa9babe.pdf?index=trueIn PDF document text
    • http://xerowavu.rf.gd/23941591505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8b7c7ba-bfa2-4940-b5bd-1b071c637823/bobafulukapudujup.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_24c93e481d4e4e5ebd0d81539a865a6c.pdf?index=trueIn 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_off0000f4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B9 5168 bytes
SHA-256: 7c7af3f2bed06744cae3306e48fb7597bbb56d4ccccb93e3cbcb96b830966c0e
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10716 bytes
SHA-256: 7861defa291d746fc039ed02a12685a7cef7d7dea0e74a78ed3ed3a5417a1d64

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