Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ee1cdb51129c474…

MALICIOUS

PDF

75.1 KB Created: 2021-02-16 11:23:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 8ef04cfd2b99e13fe4241e2991720e41 SHA-1: 160619cd41de670670385067e2c1e245fd5bf8a5 SHA-256: 3ee1cdb51129c4742bca558ebfaf4e32af18c46413dec25bb5b2004dde480fbd
126 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a phishing or malware delivery document. The embedded URLs point to suspicious domains, likely serving as lures or download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=garmin+vivofit+4 PDF link annotation
    • http://endi-itali.space/62806295859vwd43.pdfIn PDF document text
    • http://creamwalls.online/40895188167y6h6r.pdfIn PDF document text
    • http://reform-st.ru/6475157970126shu.pdfIn PDF document text
    • http://thesimplycompleteseries.com/58463954368ixx0w.pdfIn PDF document text
    • http://baugroup.info/5231151134364enj.pdfIn PDF document text
    • http://shoop-ft.ru/wafidofuzok6edki.pdfIn PDF document text
    • http://lnstagramverifiedsbadgesforms.com/magic_wand_duel_spell_casting_wizard_battleshipw0r1n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486036/normal_5ffbc5fbf2fba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383804/normal_600922c985c0d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481831/normal_5fdf3aa945978.pdfIn PDF document text
    • https://cdn.sqhk.co/fetedudi/bgf5laJ/betosew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/satuja/81050126897.pdfIn PDF document text
    • https://s3.amazonaws.com/dutuzanob/google_assistant_bug_report.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/medial_epicondylitis_treatment_nice_guidelines.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_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 4552 bytes
SHA-256: 937afc08afc356c1e8bd497f7d21c576fc0722fc11f5af203c8801aa38216df6
font_01_sfnt_off0000edcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCD 10588 bytes
SHA-256: 3dd5b5e71dfe6980c6b70b6c0472c43e1e8dc6754fe0b08323fe559cc194e238
font_02_sfnt_off000111d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D9 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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