Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0c15a857f59490c…

MALICIOUS

PDF

79.2 KB Created: 2021-09-22 19:33:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 79ec1c040431b71bd81afe69162efbb2 SHA-1: ad419e0c6e2a23aee7fe1ec1d539c74e1edd20bf SHA-256: e0c15a857f59490cd0e7a03d59be964bb1fbd65ad8b0434f0c15ae07b739a056
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution. The presence of numerous unknown URLs supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://manhalhealing.com/userfiles/file/62537426211.pdf In PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/42565195794.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/12425324773.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/xunuwiremagotig.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/12879203738.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/10906827354.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/zisuzizoze.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe9e6e2da5---37325007453.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/38366247887.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/69205200773.pdfIn PDF document text
    • http://kaies.net/upfiles/210919205217800730dyv7sb.pdfIn PDF document text
    • https://alansglobalservices.com/ckfinder/userfiles/files/44121578425.pdfIn PDF document text
    • http://nigerseedindia.com/uploads/kasuwafe.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/79070295861.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/boxefomimujotusonidimunu.pdfIn PDF document text
    • http://avvocatogiuliani.it/userfiles/files/madizetagoguvinalinapowu.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/63021862969.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/7159153023.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/81377742889.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/12313159212.pdfIn PDF document text
    • https://network-italia.it/file/48493148408.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/badupobaxabarusofim.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16148a0fe96574---70177358857.pdfIn PDF document text
    • https://dongcohonda.com/userfiles/file/32986352631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=apk+smule+karaokePDF link annotation
    • 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://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_off0000d327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD327 10292 bytes
SHA-256: 30c27ebb178aa05fa4beb2e80e18a1c06b07ad50cc8ecce06d2fc094d4ddcd0a
font_01_sfnt_off0000ea64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA64 17360 bytes
SHA-256: b868d6c0b01d508a3751615bbdb3172d7961cc82a9f430255b3bc27fbcef269b
font_02_sfnt_off00011785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1