Malicious PDF — malware analysis report

Static analysis result for SHA-256 552179476553c541…

MALICIOUS

PDF

82.7 KB Created: 2021-09-23 18:55:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f7f1ac797d244a5a9a7e20518d8cdaae SHA-1: 50b177331c89406063db40ff2fda8a010d3a8768 SHA-256: 552179476553c541b1fa50f186765da2b17b8fa88d43464a3c1e3d05a5544a5b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic and the presence of numerous external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing attack, likely aiming to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://huntic.ru/uplcv?utm_term=warhammer+40k+d%26d+pdf PDF link annotation
    • http://1mosref.ru/ckfinder/userfiles/files/rufolixoniribabu.pdfIn PDF document text
    • http://imhang.com/fckeditor/userfiles/image/kipek.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/2531822956.pdfIn PDF document text
    • http://lj-group.cn/upload/files/zivimetulejumafaxap.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/2916948960.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/87779949049.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/16966334549.pdfIn PDF document text
    • http://www.bash.cl/media/file/lumitoxigukal.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/66654958004.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/86710849329.pdfIn PDF document text
    • https://futurefacesnyc.com/uploads/file/41234340418.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/wexekumabu.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/kozarikawebapubitatugizoz.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/zifupefapinipat.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/1282609960.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/30562328942.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/99495595034.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/todezepogetuvuton.pdfIn PDF document text
    • http://w-mill.jp/images/file/45547793382.pdfIn PDF document text
    • https://vico-domrep.com/ckfinder/userfiles/files/jujefitalulejevibadipanu.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/tubogupob.pdfIn PDF document text
    • https://robodom.si/files_vsebine/77128235782.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/gawonu.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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 10172 bytes
SHA-256: 054b97a4bc4d4bc7c4ee8a2053d42faf3854a9171955000cc49a3db4c6aa5ec3
font_01_sfnt_off0000f61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2E 18124 bytes
SHA-256: f47fd7051b495d6333cee9da0567217f865334e96829b63de8d6cc8ffc7302ac