Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c46dc3fc665cdb8…

MALICIOUS

PDF

76.5 KB Created: 2021-09-15 08:44:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fb65ea0fe2de1e10ddc7f127df29c926 SHA-1: f93cb5b8468cbced94eb5af3d9e1441b362fc7a7 SHA-256: 1c46dc3fc665cdb835e2fc5e6cc501448bff9d0f5369b68da6b37f05980ddb38
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, many of which are structured as link farms or redirectors, suggesting a phishing or malware distribution campaign. The PDF's structure and the presence of external links align with the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=nikon+coolpix+android+app PDF link annotation
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/40aa9203201b8065853b2463b04c1bde/99135608166.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nisagowanobixabewizewuma.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/redavebexevaxefebinewovas.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/6515100042.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/67035900065.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109030142368317.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/80665574272.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/16655628141.pdfIn PDF document text
    • https://curvy.tw/upload/files/9079979407.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/wibumakiwabapib.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cb5085d8f5cdecdd8a2ad09db77b3ed0/83232488158.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/fogefiserudaf.pdfIn PDF document text
    • https://vietrocknet.org/app/webroot/img/files/45988339665.pdfIn PDF document text
    • https://alsharqcc.com/userfiles/files/lojog.pdfIn PDF document text
    • https://quizai.com/uploads/files/83450816539.pdfIn PDF document text
    • http://sabaparsian.com/ckeditor/files/files/25914553716.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/67170067050.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/10266169748.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/42517533081.pdfIn PDF document text
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/73241295158.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://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_off0000c5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AA 18396 bytes
SHA-256: 27c8716933bf77dad032968b7c985a46710d62b399a437910e09334ccaa25c36
font_01_sfnt_off0000f53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D54 10280 bytes
SHA-256: 863d1ca748fb6e383923bc425b635a86de2ae49561e1ecab8ea2e89293766e11

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