Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ebf42a79da9ed33…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 13:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e83476d53b90247e9e34bbc8e70ce39d SHA-1: d5122824ca815318b72b2eb247705436e9e57149 SHA-256: 0ebf42a79da9ed33982137b68ae1dbf993d81ad4298565b7033994949a04da9a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious PDF files hosted on various domains. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613332e058c99---vixojaru.pdf In PDF document text
    • http://mansiya.com/uploadfile/files/fasidapazipowomujomu.pdfIn PDF document text
    • https://marblo.com/app/webroot/img/files/61259879886.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/libilalonuzu.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/odomajeke.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/saxuxibobebijomevaburubi.pdfIn PDF document text
    • http://pinxedien.net/upload/files/27011161609.pdfIn PDF document text
    • https://xlspandoek.nl/userfiles/file/kalotusixadosur.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/73282021210.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/84720356551.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/174523047.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/93246040722.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/fekorelujofikikodawamego.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/nodaxepudirulofomasenim.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/16444582963.pdfIn PDF document text
    • http://timecraftz.com/userfiles/file/37328393977.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/95643907203.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/209d8850501139b0ccbdb8c7419424d2/tekafu.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/17135467862.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/99989383237.pdfIn PDF document text
    • https://matrixx.lu/images/lokevigatitu.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/najupimolodabinizaki.pdfIn PDF document text
    • http://xn--j1aai7d.xn--p1ai/userfiles/file/10231825697.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/medimategujiletijodekubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=vade+mecum+de+jurisprud%C3%AAncia+2019+pdfPDF link annotation
    • 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_off0000c84e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE065 11336 bytes
SHA-256: 211e099f243041993831ee37e1f3c868526512368e2c62bd9c5c708a79f4da6d
font_02_sfnt_off0000fabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABF 20180 bytes
SHA-256: 0e2ffd81ea0a7b55b691fd87b31ec5c4827c755a0897f8c138d55f67716e9e9d