Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cbe465c872cace…

MALICIOUS

PDF

71.9 KB Created: 2021-09-26 08:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c4f15c9f928cfb1a8e5f7abff472cba9 SHA-1: c036d08832957002e9afbfe4960f3a68fec51056 SHA-256: e4cbe465c872caceffb3c5c7d0702e13592a360117f36105128536cebafd7bb2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. The PDF contains numerous external URIs, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of these links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://wastran.ru/uplcv?utm_term=warcraft+live+wallpaper+android PDF link annotation
    • https://moveo-sport.pl/userfiles/file/21584128828.pdfIn PDF document text
    • https://netpage.info/userfiles/file/seguzaler.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/womofere.pdfIn PDF document text
    • https://www.edmcenter.xyz/ckfinder/userfiles/files/rizujabakag.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/bogatuwixuzaz.pdfIn PDF document text
    • http://kashima.cc/userfiles/file/63568545067.pdfIn PDF document text
    • https://scout-educationguide.com/userfiles/file/zujaroramezasaxodewigag.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/letetegexugizazor.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/pixakexijobuguraf.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/zotakefusonarolobeli.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/161428916774a5---40108810322.pdfIn PDF document text
    • http://avstralianature.ru/ckfinder/userfiles/files/kegog.pdfIn PDF document text
    • https://wietsevoermans.nl/ckfinder/userfiles/files/22331176123.pdfIn PDF document text
    • https://mots.alaxarxa.cat/cmsimple/images/file/67510681601.pdfIn PDF document text
    • http://pinedafoundation.org/imageuploads/file/nojebolinuburapi.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/76922544469.pdfIn PDF document text
    • https://elsadaulte.com/ckfinder/userfiles/files/25730008356.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/3607072506.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210901065516.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/xemudamibere.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/tikonopujukiba.pdfIn PDF document text
    • https://totszerdahelyikultura.hu/images/file/85503342773.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614136d6e5c1c---polugokuxiwumokajozexis.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/jazeroge.pdfIn PDF document text
    • http://cafesezony.ru/fck_editor_files/files/99199207165.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/vizakonekidezojimojow.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_off0000b4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE2 16804 bytes
SHA-256: ae166fb9fac82da8af0a9912a4b6f89c9ee8114df126a1ff0660b903d246250b
font_02_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 10588 bytes
SHA-256: 6f5e7ff799edcea8caa3f82f1ce605c3ec5d3f3b6997d8ff3db3d4a6b83a7455