Malicious PDF — malware analysis report

Static analysis result for SHA-256 39dbc7aab2af82b7…

MALICIOUS

PDF

83.8 KB Created: 2021-02-25 01:51:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bc1b041614fb8e51be4749beebc82460 SHA-1: 54da41dfd3b200b0c11009c0bd8ce845000e9c59 SHA-256: 39dbc7aab2af82b7fa215d6ea95d866fedc7a4ac3d22226babdbec68a4242113
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect the user to malicious content.

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
  • 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://maypoin.ru/wb?keyword=8858%20foxfire%20st%20firestone%20co PDF link annotation
    • http://taygerr.com/massachusetts_superior_court_rule_9a_changesow4nt.pdfIn PDF document text
    • http://pokemonrivals.online/contact_information_sheet92ha9.pdfIn PDF document text
    • https://radigaligoled.weebly.com/uploads/1/3/4/3/134333621/49e80e6.pdfIn PDF document text
    • http://steblin.pro/76506627484iyev4.pdfIn PDF document text
    • http://prolac.ru/zemavowo348ic.pdfIn PDF document text
    • http://businessmentality.com/effet_doppler_terminale_s55bx0.pdfIn PDF document text
    • http://umniashka.ru/juwamotugimeanb0u.pdfIn PDF document text
    • https://wosobariwosamu.weebly.com/uploads/1/3/4/3/134372044/megusawubepuwij_lozojutakavor_vijapijolafuz.pdfIn PDF document text
    • https://texoxarisozitew.weebly.com/uploads/1/3/0/9/130969357/e8840b2d196cc.pdfIn PDF document text
    • https://xinuluparos.weebly.com/uploads/1/3/0/9/130969110/403036.pdfIn PDF document text
    • http://ersoil.fun/fast_auto_clicker_for_cookie_clickerd8vdv.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/migivewuwe/7346439751.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/vietnam_travel_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/bewibiwat/messenger_old_version_apk_uptodown.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_off00010aee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEE 4924 bytes
SHA-256: ca00380d74d2aed8ae46f4482d3f8216577b8beea7a2b81ea9990cd2e9f73b3f
font_01_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 11428 bytes
SHA-256: 2f4602289b65bbb5390d362ec1015e73532e08285be40c1cc4db7fe70bda7517

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