Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd242f42545d8f8…

MALICIOUS

PDF

78.9 KB Created: 2021-02-24 21:17:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 090915114701cad9e6be53cc85aaed5b SHA-1: 791345b65a1b1160276836df24f162c3fbc83089 SHA-256: cbd242f42545d8f89c4ce7f33b740a18cc0bf5169329217cc4d6869e27122438
184 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create malicious PDFs. The numerous embedded URLs, many pointing to disposable domains or link farms, strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/award?keyword=the+game+rapper+most+popular+songs In PDF document text
    • http://mirunex.iblogger.org/binomial_and_normal_distribution_worksheet.pdfIn PDF document text
    • http://xuzokunomiba.iblogger.org/megixif.pdfIn PDF document text
    • https://cdn.sqhk.co/dexijonur/jehiwjg/character_story_planner_2_app.pdfIn PDF document text
    • http://getegenufiduso.66ghz.com/jojuvuvekex.pdfIn PDF document text
    • http://nickned.me/govejuzawukanons6idl.pdfIn PDF document text
    • http://roverebi.22web.org/aprendizajes_clave_primer_grado_secundaria_ingles.pdfIn PDF document text
    • http://sodahq.club/lukigefaxilajipepu4mvzw.pdfIn PDF document text
    • https://cdn.sqhk.co/sivadapexiri/hhjfYuW/3m_post_it_notes_for_desktop.pdfIn PDF document text
    • https://cdn.sqhk.co/jamasedese/bjjgeVx/47656471200.pdfIn PDF document text
    • http://cashtanks.fun/75838147442a91xv.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/jddwE9y/bozevifivutanuporipe.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/jhxVKLH/ketadabavowubasoxesup.pdfIn PDF document text
    • http://vinograd.io/xotuxaxivezamojif5egu.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/dOiiGcC/kobuxijevunofobar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415740/normal_5fcdc9011e027.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://givemuzod.epizy.com/population_census_2011_nepal.pdfIn PDF document text
    • http://xuposusan.epizy.com/78476670422.pdfIn PDF document text
    • http://wawaxujogoned.rf.gd/hypertriglyceridemia_guidelines_endocrine_society.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_off0000f8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AB 5184 bytes
SHA-256: 1727e2dbeb438aff8f9fc09fa88eb57f82ce118c27d266442f182ba78c6cfb29
font_01_sfnt_off00010a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A25 10460 bytes
SHA-256: 44f8aacd4faac665aa8a5cfdfefbdaf95c47e15feb4f909cca01819967ef57f2

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