Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4bd787c44a4c4e…

MALICIOUS

PDF

86.6 KB Created: 2021-02-21 21:09:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0dfb64afcc49a6e3043e48073a557f06 SHA-1: 9482a05eff495eceb2efb1bceae9d859fb5d4805 SHA-256: 8f4bd787c44a4c4e5eea9ce32d53abd038d423e79a2c7ff638e927abcae04c2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/wix?keyword=phr+study+guide+2015+pdf+free PDF link annotation
    • http://hotsales-com.xyz/86969480909ivzch.pdfIn PDF document text
    • https://konilusikiwi.weebly.com/uploads/1/3/3/9/133986353/2d8ec7e.pdfIn PDF document text
    • http://idealica-official.website/paxekisez0tgnr.pdfIn PDF document text
    • http://francobusiness.com/france_application_form_for_schengen_visa9cxhj.pdfIn PDF document text
    • http://trudogoliya.online/mowosizusekolelodeliguzbwydo.pdfIn PDF document text
    • https://cdn.sqhk.co/notenirikev/3H3pheq/paper_wings_book_quotes.pdfIn PDF document text
    • http://detonic-deutschland.website/orange_tree_inn_deland_flqnk60.pdfIn PDF document text
    • http://servisvds.ru/60366926138cuv1z.pdfIn PDF document text
    • https://cdn.sqhk.co/wefekoferu/jgEBhes/open_ballet_classes_nyc.pdfIn PDF document text
    • http://italystore.pro/kedixarevucvr1x.pdfIn PDF document text
    • http://olipaka.xyz/metallica_all_albums_freesa8j6.pdfIn PDF document text
    • http://ch-bewertung-2888.xyz/tidevarho28k.pdfIn PDF document text
    • https://cdn.sqhk.co/majatuto/Meih1OD/tetubo.pdfIn PDF document text
    • https://vejarava.weebly.com/uploads/1/3/1/0/131070596/6941435.pdfIn PDF document text
    • https://kitabenulo.weebly.com/uploads/1/3/0/9/130969432/wanotawumozoz.pdfIn PDF document text
    • https://medofigovur.weebly.com/uploads/1/3/5/3/135316586/juxisukijapid.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/dozore/articulos_cientificos_de_biologia_celular.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_off0000ff3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF3A 5616 bytes
SHA-256: 1a7ef6fb5dfa27ece644463490e64a7c386704548841892dfd4f59a3fcc340d9
font_01_sfnt_off0001126f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1126F 11172 bytes
SHA-256: 4f4801e6b5e05d805027d8853cbd81248fdd89f08acc3a5a34d6ebb79c403b85
font_02_sfnt_off000138d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138D6 16036 bytes
SHA-256: 9559dd1bd908241551916101fda3d445a26f5c4b506a1423f23393456f9d5940

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