Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b552b2149b8581…

MALICIOUS

PDF

73.8 KB Created: 2021-02-18 03:28:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 0f7bb376f3b5acec0ce656070df48fc7 SHA-1: 6b8396547194437314f4ee295d84d4d41fb070ba SHA-256: e1b552b2149b85818f986cc03831f896aa76acb810b825af15dcfde29fd9ea51
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains and link farms, suggesting an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and 'Qt', indicating it was likely generated by a tool rather than being a legitimate document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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/wix?keyword=northeast+region+states+worksheet PDF link annotation
    • http://xipevufizokev.iblogger.org/kegisovoka.pdfIn PDF document text
    • http://hookup753.fun/planning_engineer_interview_questionslu27x.pdfIn PDF document text
    • http://agentsoft.space/xutebubeponiwownya3.pdfIn PDF document text
    • http://repefokuxogefu.22web.org/gutanose.pdfIn PDF document text
    • http://teksalon.xyz/blue_mountains_national_park_guided_tours7mcsh.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/gjzjdja/wuxexozu.pdfIn PDF document text
    • http://all-system7.xyz/desierto_drive_mexican_dreamgo1v1.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/xafaxotaful/hotspot_shield_full_apk.pdfIn PDF document text
    • http://viputuv.rf.gd/don_t_starve_ps4_beginners_guide.pdfIn PDF document text
    • http://rikonuge.rf.gd/povelewiwutozumozot.pdfIn PDF document text
    • http://waminakukivexo.rf.gd/gitanano.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/cash_receipt_template_for_car_sale.pdfIn PDF document text
    • http://minofadejewezup.rf.gd/emoticons_facebook_en.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC16 5040 bytes
SHA-256: ab302b92522db95934142bc4a1761779a9425649f910d6a9711032fbd17f7b15
font_01_sfnt_off0000ed42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED42 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 10560 bytes
SHA-256: 8403794487ae021e6116edcf4363cd8f340b1c26ee77db4a9bdd9c14410b809c

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