Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afd550237453adc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 03:20:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4b123157acfa58d05a1fe278a5abc25b SHA-1: b3f836e577bccea7a4cb96b8793258f2b8e767d9 SHA-256: 5afd550237453adc058edf38c9785b8b3439e47754e60f37e9a63100c7d9ec0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The `wkhtmltopdf` authoring application and the presence of embedded URLs indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=intelligence+test+pdf+download PDF link annotation
    • http://epwuae.com/userfiles/file/vexezufoduxibu.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/37810169145.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/15639817736.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/kexiberolatur.pdfIn PDF document text
    • http://theponghop.com/upload/files/rasafi.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/megapesozos.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/50960623129.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140773de2859---35855200717.pdfIn PDF document text
    • http://precisao.net/files/files/fataripugemofajetamazabil.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/48311805536.pdfIn PDF document text
    • http://premiercontainerlines.com/media/ftp/file/vexagajini.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/xawata.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/ratitajafos.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/joxesatewuvakamisidilaz.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/lamogoxevadabosomew.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614660b00ab20---jifagumap.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/44083972950.pdfIn PDF document text
    • http://screen.by/images/file/11608454272.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/81028490556.pdfIn PDF document text
    • http://tfforming.ru/d/files/30491347003.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/xunigugavenopexirukesew.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/dotuwobarumobog.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109181917522011.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_off0000d2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2FE 17392 bytes
SHA-256: 475627820f0748b06004f01a73cb6cad00ab4b46cfe39fff13d73461d02dac31
font_01_sfnt_off00010051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10051 10732 bytes
SHA-256: 75fdeb409c274c90a4ec4de47c5bd1a8fe69ac4425dd394917aca7c44444aead
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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