Malicious PDF — malware analysis report

Static analysis result for SHA-256 0461b9148a994026…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 20:37:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3228260fb9789743179689da53e8c49a SHA-1: 9e87cbee4d526234b6c3993224ea70da4557526c SHA-256: 0461b9148a9940262c06566b59765a2792764e5ca368755d1d93b448df03e830
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The presence of external URIs and the overall structure suggest an attempt to trick users into visiting a compromised site, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://allytemp.ru/uplcv?utm_term=configurare+account+mail+su+android PDF link annotation
    • http://ulrike-mayer.de/userfiles/files/mijaboguzat.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/67045961528.pdfIn PDF document text
    • https://mimpishio.com/contents/files/45510463698.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/80176566979.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/6873460910.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/38568643645.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/97569558140.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/74044960834.pdfIn PDF document text
    • https://elsa-daulte.com/ckfinder/userfiles/files/zakusorefapiganatebuvak.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141199086be1---62387175101.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/10008567032.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/sazorowojotuweveximinowax.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/wolezudiruk.pdfIn PDF document text
    • https://presstone.hu/userfiles/file/gejeguji.pdfIn PDF document text
    • http://5thaveseniors.org/userfiles/file/86110722274.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/17136378926.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/61672332421.pdfIn PDF document text
    • http://sineadstone.com/userfiles/file/26271558558.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/46680195823.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/65144705659.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/dulimudopanidaramojak.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/e3067f5434e29a092fd72ca6cd0a6ab0/lememosizu.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/28453888897.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210902215303.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_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 18356 bytes
SHA-256: bdf95660a4e7aa58b5322f265bbbdab1f26df99852a2470aec37235b7db05ebb
font_01_sfnt_off0001202e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1202E 10952 bytes
SHA-256: 1ae0aa1e01fc76d9984960a3c5357fb092fcf9a7e767428ba1d9ca050a22e2b4
font_02_sfnt_off00013967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13967 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1