Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7f520e9e5d86aa5…

MALICIOUS

PDF

82.8 KB Created: 2021-02-16 21:20:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2a3c0e4c163e8c7401ae91c19efb95f2 SHA-1: 810bc09ee9e94b92972852546161ad2af7cf7084 SHA-256: e7f520e9e5d86aa50431dc461607f1f21af70337bab310c35b500033934d8e01
186 Risk Score

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 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/strik?utm_term=the+white+princess+netflix+uk PDF link annotation
    • https://gojudewusidaza.weebly.com/uploads/1/3/4/8/134888042/3313613.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwopazeg/bhaidHr/1861768390.pdfIn PDF document text
    • http://naturfresh.fun/95499404562fet3s.pdfIn PDF document text
    • https://zopatiselinijil.weebly.com/uploads/1/3/4/7/134758238/volik_badakaz_tizudejavuga.pdfIn PDF document text
    • https://cdn.sqhk.co/xufojidaju/hgCNEUT/jumegevowageseli.pdfIn PDF document text
    • https://fapuwokezisojo.weebly.com/uploads/1/3/1/4/131453853/zosivekuzuza.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/e07e8e99993c5.pdfIn PDF document text
    • https://lexizade.weebly.com/uploads/1/3/4/3/134368494/bovuwat-padaboj-wuzepapafeno-jenokusoxepate.pdfIn PDF document text
    • https://xojowikenokux.weebly.com/uploads/1/3/4/7/134706662/piliraz_mogeb_tenazovoxib.pdfIn PDF document text
    • https://cdn.sqhk.co/fedugaxoloz/bjijahh/milikowafijuvijubujeniki.pdfIn PDF document text
    • https://vovikadu.weebly.com/uploads/1/3/4/5/134587732/cce447e2ad032.pdfIn PDF document text
    • http://white-x.fun/bernina_1090_manualv82y2.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/ninegexi-pipebusojili.pdfIn PDF document text
    • https://cdn.sqhk.co/kisesawaropo/jjhji6C/metaphysics_masters_degree_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/4hjoGNc/bojokasuvafamupima.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/5372810.pdfIn PDF document text
    • https://cdn.sqhk.co/kekumumaxow/idna9Wj/best_fb_status_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/hjieO2k/8113186981.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0001056f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056F 5068 bytes
SHA-256: 2536a183b3462c6fa002f6ed0d1ee07d4ad813ecd2a9b7c2e7c7aadce32121bb
font_01_sfnt_off000116c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C0 11668 bytes
SHA-256: bb800671e7d2a89cc3398c984a4133ca0af215aa68d727dc691ab8a803751182

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