Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e93ca9593ef53f9…

MALICIOUS

PDF

80.4 KB Created: 2021-02-25 09:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 60ffd883d8faf6a067eee59f19f8240c SHA-1: 0c5ce48c3c2cdf2345f32fc901f0349b28f485e9 SHA-256: 4e93ca9593ef53f9371067a3f0d1462b9a545f965d7e22fca82e1f1bbf6e688c
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious and invisible links pointing to external domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of embedded URLs and the PDF_SUSPICIOUS_LINK_LURE heuristic confirm the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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/award?keyword=ejemplo+de+ensayo+con+formato+apa+6 PDF link annotation
    • http://stingeksoj.online/3357558791t9qpa.pdfIn PDF document text
    • http://fajutixosisi.22web.org/postpartum_depression_treatment_guideline.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412599/normal_5fd8857bddf80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496826/normal_5febed022c6e1.pdfIn PDF document text
    • http://managerprogram.live/lakshmi_hrudaya_stotram_teluguxsnd0.pdfIn PDF document text
    • http://krepezh.guru/towulirumosojekejisasiweir70l.pdfIn PDF document text
    • http://rasudilikid.mywebcommunity.org/bruce_lee_greatest_movies.pdfIn PDF document text
    • http://cmb-eco.com/mobile_harley_davidson_mechanic_near_mes0k86.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388833/normal_5fda41c8a860d.pdfIn PDF document text
    • https://cdn.sqhk.co/miviterul/LLgjwhe/muwatije.pdfIn PDF document text
    • http://delinapod.mypressonline.com/46685137292.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447084/normal_600049b94efdb.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/purawuma/v1_guided_bus_timetable.pdfIn PDF document text
    • http://gozudivigel.epizy.com/munoziwuwifeneben.pdfIn PDF document text
    • http://dukifubu.epizy.com/vuzowuzopazunususetiga.pdfIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/36755785877.pdfIn PDF document text
    • https://s3.amazonaws.com/fasudikek/free_proxy_vpn_apk.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_off0000fd22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD22 5592 bytes
SHA-256: 55afb34a7fa9f9c1d5b8d44cae63afd6baa1b31cd523ae6cd9357902f0075227
font_01_sfnt_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 11228 bytes
SHA-256: 81e08c39cf2015949eba29394c904272ea1b7752cb88010698f71cff135fed99

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