Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77bada0e6d0bb75…

MALICIOUS

PDF

70.3 KB Created: 2021-02-23 05:22:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 482d4778d72d0aea7fdc126d684b3cf8 SHA-1: dabf17527b8364cde2ff663b25514587139974a1 SHA-256: c77bada0e6d0bb75e25004e41cce8d367485e71ef2cab49c8da006c99ff43b92
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://jacksth.ru/strik?utm_term=is+vedic+the+same+as+sidereal PDF link annotation
    • http://eushopvmn.site/dumewililewanulewiraxemz6aa1.pdfIn PDF document text
    • https://cdn.sqhk.co/lerapuraroke/iaIihhb/viwemidexexalusugivagokir.pdfIn PDF document text
    • https://susakatevasek.weebly.com/uploads/1/3/4/8/134871092/dc097fc459.pdfIn PDF document text
    • http://copyrights-notices-helps.com/6944448612z2sjo.pdfIn PDF document text
    • http://telgrm.site/790360869792s2eu.pdfIn PDF document text
    • https://wikafifej.weebly.com/uploads/1/3/2/8/132815388/5664ae.pdfIn PDF document text
    • http://milanomoda-italy.website/81856026049q2lb1.pdfIn PDF document text
    • http://krokoboko3.xyz/giguredzg9ya.pdfIn PDF document text
    • https://vuvuzuvikedatun.weebly.com/uploads/1/3/4/5/134529562/pimelazafo-tojolexot.pdfIn PDF document text
    • http://artrosil.xyz/kenozifusakenatezogi0argk.pdfIn PDF document text
    • https://cdn.sqhk.co/vituxezij/hghLPXO/84138930180.pdfIn PDF document text
    • http://coolmag.biz/xasililusolicpjap.pdfIn PDF document text
    • https://relitemora.weebly.com/uploads/1/3/4/3/134352419/7296984.pdfIn PDF document text
    • http://nazhivy.net/tovolum8adm.pdfIn PDF document text
    • http://trening-ekaterinodar.ru/lexus_gx_460_price_in_uae_2020wde07.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/wiremeresegikon/tamil_to_english_keyboard_app.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/70499090046.pdfIn PDF document text
    • http://goporiwip.epizy.com/bee_gees_tragedy_album_free.pdfIn PDF document text
    • http://daponub.epizy.com/company_profile_template_psd_free.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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 5176 bytes
SHA-256: 1f5f24b49fd0e15496dbf88341a8508a5050ec8a62e642f0848ed76ba6eb9895
font_01_sfnt_off0000e905.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE905 10064 bytes
SHA-256: bf82e109e7b50aa49b96ae4c0d77273814fbf9446b8d6d8b60ed4daf3b5e726f

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