Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d5eef42ea3a8f7…

MALICIOUS

PDF

68.5 KB Created: 2021-10-01 05:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b20fb9115671f69d1e1ae2874f1069fe SHA-1: e184ac961d093cb6d632fe332c7e19d8b9feff84 SHA-256: c0d5eef42ea3a8f77c706d1f07d58d5ac2c29d0165b7e87165bb8d52153f1398
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://nomylo.ru/uplcv?utm_term=secret+robux+generator PDF link annotation
    • http://carbontuning.ru/file/bogodobugonizojofetosu.pdfIn PDF document text
    • http://a9188.com/upload_files/art_files/files/20210918_171930.pdfIn PDF document text
    • http://mrukseo.pl/userfiles/file/tetadipowidoseloriwukiza.pdfIn PDF document text
    • http://kp-technik.cz/ckfinder/userfiles/files/8597300064.pdfIn PDF document text
    • http://sms-dk.com/FileData/ckfinder/files/20210911_006626DFD6328F7B.pdfIn PDF document text
    • https://fptica.ru/images/file/jekata.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/bonojujuj.pdfIn PDF document text
    • http://monticellotownship.org/userfiles/file/kakekevodoge.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/kedanebi.pdfIn PDF document text
    • http://tolaniprojects.com/userfiles/file/dizotiludumupiwojedizoni.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109231938333073.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/1707311582.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/duvirutexeloxusamir.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/tekubukojopire.pdfIn PDF document text
    • https://weboonline.com/ckfinder/userfiles/files/maweregita.pdfIn PDF document text
    • https://hefcom-hydraulics.com/ckfinder/userfiles/files/bugodusanovodowusap.pdfIn PDF document text
    • http://jmlukanich.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42060607744.pdfIn PDF document text
    • http://eastindiaspray.com/suvra/eastindia_spray/files/91024273154.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/33361994972.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/bisunesag.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/xokutaxatejirogitesik.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/wijovaranusulutedalolak.pdfIn PDF document text
    • http://agroanaliz.by/upload/editor/files/41338027079.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_off0000b011.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB011 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC823 14404 bytes
SHA-256: ea7cbb542cd51a406994807da9481ce0cb2fc402b83d16d7008a205af96d02ec
font_02_sfnt_off0000ec42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC42 10516 bytes
SHA-256: f675082986a5969254eda2982a77eff0210af955204545557947ab0c44af608a

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