Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1d8f818658a98a…

MALICIOUS

PDF

165.7 KB Created: 2021-02-22 14:56:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 28e4f7d1b6151d20fb4ef90c79b05d59 SHA-1: 28b8dbcf5db2bdd2dc1d48fe69dcb7b26a3d8655 SHA-256: 8c1d8f818658a98a85e232fabf31dbaeeeaca75a0db24e5de2531d124962c768
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://bologen.ru/123?utm_term=julius+caesar+william+shakespeare+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385026/normal_600322faedc20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445104/normal_60339b45d6203.pdfIn PDF document text
    • http://chambrely.xyz/guvuxitudevolurgx3h7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417824/normal_60264ab66fc4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443815/normal_5fee0acc6b47e.pdfIn PDF document text
    • http://lazerepil.site/ccna_lab_tutorialjra62.pdfIn PDF document text
    • http://cg-designer.xyz/dunham_classification_of_carbonate_rocks3b61a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471958/normal_5fd0d6c4e6796.pdfIn PDF document text
    • http://g00y.xyz/slot_car_diarydzwsi.pdfIn PDF document text
    • http://hookup668.site/601229599930lift.pdfIn PDF document text
    • http://milanbeachs.space/convertir_1_16_pulgadas_a_centimetros1cic0.pdfIn PDF document text
    • http://oneitstore.pro/vaboduluwisuxl0ijr.pdfIn PDF document text
    • http://choosenews.space/fluid_dynamics_textbook2svui.pdfIn PDF document text
    • http://zhigina.ru/57003005403d4x5d.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/zafaronivaj/andy_black_ghost_of_ohio.pdfIn PDF document text
    • https://s3.amazonaws.com/seriposuj/wixijakexoviti.pdfIn PDF document text
    • https://s3.amazonaws.com/kozibowisenatu/sig_sauer_p226_spring_airsoft_pistol_with_metal_slide_black.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000252fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x252FA 5540 bytes
SHA-256: aa4d5e1dcf11034a7fc7e2aeec2cc2e9f853f1e68332a90e8daedf5c7c83a6db
font_01_sfnt_off000265bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x265BB 10192 bytes
SHA-256: 433b8d63489a5759a84ba5f1b373bbe73004183810ac7eb4e0e49ea24d410e3b

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