Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd2a1cf8f844efd4…

MALICIOUS

PDF

80.0 KB Created: 2021-09-18 04:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 00eb8f1b64e02ad0f5885c6850adce5a SHA-1: 7b9b8211cd26377e0c6c0d904c53f653d7bc122e SHA-256: fd2a1cf8f844efd42c88169f61e4d550be84dc83ac129c6ec4a336da8aa67186
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://krisoc.ru/uplcv?utm_term=gta+5+mustang PDF link annotation
    • https://ecoolteh.eu/galeria/file/45464003994.pdfIn PDF document text
    • https://udruga-invalida.hr/files/46270048907.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/ritesamorilokerekezefade.pdfIn PDF document text
    • https://cafesca.org/ckfinder/userfiles/files/zovawaxavuseroma.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/nejetewavalipudeviwijak.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/kapifaz.pdfIn PDF document text
    • http://kientrucnhacuagio.com/upload/files/83848061289.pdfIn PDF document text
    • http://cgl.lu/userfiles/files/bopepazovodavev.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3490023c3---65121878646.pdfIn PDF document text
    • http://wonikquartz.com/upload/editor/file/1631917017.pdfIn PDF document text
    • http://pngroup.pl/ckfinder/userfiles/files/leganasapegeliwowonu.pdfIn PDF document text
    • https://best-of-geldanlagen.de/userfiles/file/89759966727.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/t5eht5ia8ve5bt50kl6gslimga/miworigudevugutagetupev.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/kigoxizu.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/72643253068.pdfIn PDF document text
    • http://strelnicebudejovice.cz/userfiles/file/redaburufadopemerojowibe.pdfIn PDF document text
    • https://bonaparte.cappencms.com/templates/files/74365003125.pdfIn PDF document text
    • http://jca-t.com/fck_image/file/61470883767.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/23849816350.pdfIn PDF document text
    • http://resumesfromabove.com/userfiles/file/bomijetefuvut.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/29931335141.pdfIn PDF document text
    • https://3eyamaichi.com/upload/ckfinder_temp/files/20210915215506.pdfIn PDF document text
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/44758344460.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_off0000d52d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 18008 bytes
SHA-256: fd6132093da6a3550c4c23e1cbe663fb486048d5e74624785e3049d9a9728f6d
font_02_sfnt_off00011c0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0C 10232 bytes
SHA-256: ff23e51ec9f1f08a6f26518c4295b8e20b0b28d4e3e19c1ecb012487eaa5b1ae

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