Malicious PDF — malware analysis report

Static analysis result for SHA-256 95551416742a7b6b…

MALICIOUS

PDF

92.7 KB Created: 2021-03-10 13:06:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5eb053411c6432bef165738176abd156 SHA-1: a6d580b54da76c98ef2ff7dcf42c8ed79d9b2848 SHA-256: 95551416742a7b6bce2fb68e8f1611a074b65658b3bdb645ca316736feffed0d
134 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, including one pointing to a suspicious domain that appears to be a link farm. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution. The presence of a download button lure further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://jumiwimov.ru/wix?keyword=du+screen+recorder+apk+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4423699/normal_5fca93dfa0676.pdfIn PDF document text
    • https://cdn.sqhk.co/lupobikud/isjji2E/residential_construction_schedule_template_excel_free.pdfIn PDF document text
    • https://cdn.sqhk.co/lanuniwa/dhgFjdo/8579038971.pdfIn PDF document text
    • https://cdn.sqhk.co/zatovafer/HB5mJgj/screen_time_for_kids_app.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/how_long_to_study_to_pass_pmp.pdfIn PDF document text
    • http://helpcenter.business/122128841063xkvb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464315/normal_601e74b275fa4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495974/normal_5fe234929ffe9.pdfIn PDF document text
    • http://meblik.su/calibre_software_user_manualgaw7f.pdfIn PDF document text
    • http://wifisef.medianewsonline.com/vodajotebiripenaxolul.pdfIn PDF document text
    • http://pifovabu.getenjoyment.net/rurimubapusosotobedo.pdfIn PDF document text
    • http://wersita.space/249171966321sj74.pdfIn PDF document text
    • https://cdn.sqhk.co/bexoninodag/CjjWjj0/57068120889.pdfIn PDF document text
    • https://cdn.sqhk.co/daladovum/iidH4hc/stickman_destruction_4_annihilation_mod_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/cdde6864-3455-4c17-af0e-a71b5f146cc2/xetuvonobuxe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86b7c2ef-76fd-4291-a8b2-7ba69ed9cccb/90020563537.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/18131546868.pdfIn PDF document text
    • http://wutesejib.onlinewebshop.net/53710486097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f99d8388-0e51-4c00-bd8b-94d6e16e688a/resumen_del_cantar_de_mio_cid_por_cantos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f83fe0b2-fb0a-4011-a563-39ce405ed2e5/how_to_find_the_global_period_for_cpt_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0228121-f4c7-44b4-897a-cc1831f35026/18706475986.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/clash_of_clans_mod_apk_offline_revdl.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 5304 bytes
SHA-256: 0701c68809b4fdc3d67c1312be5c08ace363bad3df28f84c539133c8326eb519
font_01_sfnt_off00012cd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD8 10276 bytes
SHA-256: 3540f01abe70605672f2bd2ac51b77c2e33bd06e2e43e88d5cd76ef4a350c8f8
font_02_sfnt_off0001500e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500E 16076 bytes
SHA-256: 20dc835fdb26e5c8b2bf371a74de3f1f2251d0d540cd54084ecb3d27d8cc4587