Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea5f78e6668ef31…

MALICIOUS

PDF

80.4 KB Created: 2021-09-11 23:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 71a07e23b7e3b1e19dedeccb12c38f49 SHA-1: 4b87dcbab7d6384b039dcb7c64bbc1ab8ba8f98d SHA-256: fea5f78e6668ef3121ef3a29b544b76c7d3ceee26437ce6a0cbf64ea4bbebed3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF that exhibits characteristics of a phishing lure, as indicated by the 'SE_INVOICE_LURE' heuristic. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests an attempt to redirect the user to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://sainaudit.mn/File/4622633768.pdf In PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/moxenokafoxikamubo.pdfIn PDF document text
    • https://combrooncom.com/contents/files/94946844610.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fipatefuserowud.pdfIn PDF document text
    • http://sunrui-ti.com/d/files/bimudobifubejetuvagetetuv.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/fawokodaxapuxifisur.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/97299444285.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/89028337676.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/movetumikaxetivemimuja.pdfIn PDF document text
    • https://kokomanis.com/contents/files/13231444031.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/22e896ae2c75e3b6454f40882cf3a252/47362133043.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/faxarifipozexajawu.pdfIn PDF document text
    • http://aloisiquadri.it/userfiles/files/medolibopagutudiv.pdfIn PDF document text
    • https://812423.qqtogeljackpot2.com/contents/files/12418398799.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/lizanuvedulukubijuso.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffc3c13237---41423011333.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/36056875409.pdfIn PDF document text
    • http://medicom.pl/userfiles/file/zekuseviwebup.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/kulezaminopameralek.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///15060934827.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161370ccd78d71---naniloseneguxuxigisifine.pdfIn PDF document text
    • http://fundacionecla.org/resources/original/file/nibofutazitinitozidaguf.pdfIn PDF document text
    • http://4els.ru/uploads/images/files/61290523539.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=smarter+faster+better+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_off0000d776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD776 17404 bytes
SHA-256: a6177bcafbe7801bfe4650f83d17cf463bebec1b5b4af162d0632bc603121b2b
font_01_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 10512 bytes
SHA-256: 9a9d5faa97d59717c2ca368d5230dcb26276f11c0b457bce49ba0e75a17b9c80