Malicious PDF — malware analysis report

Static analysis result for SHA-256 a924392414dfa520…

MALICIOUS

PDF

79.5 KB Created: 2021-03-05 06:55:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: f6c38b694520baa499223c8cdefd4125 SHA-1: 59d3bcb6cf1fc39c6df032e843acfa45fe69166b SHA-256: a924392414dfa520d88faf5b8e4b0d5a84eee2c99554b78b051f554e92ebc47b
126 Risk Score

Malware Insights

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

The PDF document contains multiple external URIs, with one specifically identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to a search query, directing users to potentially harmful websites.

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
  • 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://zajinet.ru/strik?utm_term=how+do+you+cook+brown+jasmine+rice+in+a+rice+cooker PDF link annotation
    • https://lorufolirosob.weebly.com/uploads/1/3/4/5/134584190/6584537.pdfIn PDF document text
    • http://zozuwax.66ghz.com/defense_travel_system_hotel_tax_exempt_form.pdfIn PDF document text
    • http://forsage.pw/azamara_club_cruises_headquarters_phone_numberaoino.pdfIn PDF document text
    • http://kazedoruredupe.22web.org/euphemism_practice_worksheet.pdfIn PDF document text
    • http://dekupedatibidal.iblogger.org/93408787388.pdfIn PDF document text
    • https://kutabafimuv.weebly.com/uploads/1/3/1/3/131379381/7250926.pdfIn PDF document text
    • http://detonic-ufficiale.website/70887088703e4iqv.pdfIn PDF document text
    • https://cdn.sqhk.co/rigepasemapa/igjjfG2/kushi_movie_music_ringtones_free_download.pdfIn PDF document text
    • http://nesobaka9.xyz/jipefojxac75.pdfIn PDF document text
    • https://cdn.sqhk.co/roziguze/hbPhess/classic_phone_ringtones_free_mp3_download.pdfIn PDF document text
    • http://zoxovimukanig.22web.org/blank_christmas_gift_certificate_template.pdfIn PDF document text
    • http://tolagipifumer.iblogger.org/sogedusivuxozinotunol.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://guziruxasa.epizy.com/punowimet.pdfIn PDF document text
    • http://piwefijegiv.epizy.com/berijobarubagumekozavuga.pdfIn PDF document text
    • http://judixipe.epizy.com/pipiwunaxoxafibiror.pdfIn PDF document text
    • http://pagosunizuboroz.epizy.com/rubik_s_cube_algorithm_cheat_sheet.pdfIn PDF document text
    • http://doroxepazu.epizy.com/nelutizojobatesizedike.pdfIn PDF document text
    • http://jeburam.epizy.com/wendys_chili_nutritional_information_large.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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 5488 bytes
SHA-256: 9c542503a7cc6354bebdd5504563605d16f0e584d82d533d9fe3df3be50ce4d4
font_01_sfnt_off000109d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D4 11484 bytes
SHA-256: 0323616342e76d44aaa2e1193d48ff64723804f80fe74910cb2006c70e1d7595

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