Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdcc0508836ebdff…

MALICIOUS

PDF

73.2 KB Created: 2021-09-26 23:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3233dab2e3c75aa3e05653410787f25 SHA-1: e39ce6a092f1d5141b741fa5d166711737ffcf96 SHA-256: cdcc0508836ebdff1e51ca978b836d4c87387eec8473e79fad54fb68d8c930e5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the presence of external URIs and the overall detection suggest an attempt to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 http://www.icf-plant.com/files/file/53946997135.pdf In PDF document text
    • http://www.polni.si/Images/files/72076936575.pdfIn PDF document text
    • http://kawanmto.org/contents/files/zuzopuloxedefijavila.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/kidoboxedawi.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/45467658582.pdfIn PDF document text
    • https://viktorina.ledoritulys.lt/files/tajuvimuxadobasoze.pdfIn PDF document text
    • http://viermaalh.nl/Bottesteyn/Site/afbeeldingen/file/27616270331.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/podixokobuwifixuzizul.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/ledumo.pdfIn PDF document text
    • http://coca-colalife.eu/userfiles/file/89522084630.pdfIn PDF document text
    • https://kohphanganhotelandtour.com/userfiles/file/61805700892.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/80429680403.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613d042bd0265---68442034605.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/22474040503.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/mofiluwanadu.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/17119003350.pdfIn PDF document text
    • http://ogledalata.bg/uploads/pages/files/rinuk.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/161467c881d41a---degexulege.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/74304833968.pdfIn PDF document text
    • https://fontaine-eva.fr/userfiles/files/38330220220.pdfIn PDF document text
    • http://drivescuolaguida.it/userfiles/files/40900108236.pdfIn PDF document text
    • http://prestinoequitacion.com/imagenes/upload/files/kimipuwakigu.pdfIn PDF document text
    • http://aquatherm-graz.at/files/18600281151.pdfIn PDF document text
    • http://salman-is.com/userfiles/file/divererekimamilapedifimad.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/48156270255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=spider+man+far+from+home+download+full+moviePDF 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_off0000b638.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB638 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 18636 bytes
SHA-256: 64fe236355200deb0f786449f669ab4b7b72c73ea8ff2e8dcef2e411eb190aef
font_02_sfnt_off0000fe76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE76 10824 bytes
SHA-256: 7a989841220615ee9b40826df8dc80830b286f61fd7d42a71e5a9b90fc4bf843