Malicious PDF — malware analysis report

Static analysis result for SHA-256 58c0fb1a2adb8098…

MALICIOUS

PDF

82.5 KB Created: 2021-09-06 11:09:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e61590677b0e145200eb27bd03d526d5 SHA-1: 087b780aeaa758db219439bcfa692370ac48b757 SHA-256: 58c0fb1a2adb80980dc6e97cfadef53269dabd0d21d3c4f717ab47ff57177baf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://retrolondontees.com/userfiles/file/94554766346.pdf In PDF document text
    • https://nikosdimos.gr/userfiles/file/nomekebebulubogonota.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba08055246---fusefokolamolu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/womemilaraduforaboxek.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210810153142.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/belizisujoribuwaxuz.pdfIn PDF document text
    • http://stressmanagement-karriere.de/userfiles/file/88138808647.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d71c51dca---dimisinatexafowezi.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/30062719813.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/jifube.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/7886535549.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/rugujurigafal.pdfIn PDF document text
    • http://jngf.cn/files/file/benosepusafodef.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/33599989111.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021061103560773499.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/91805665407.pdfIn PDF document text
    • http://blueyee.com/upload/file/140330022235.pdfIn PDF document text
    • http://southwest66reunion.com/clients/f/f6/f6f8b7bd17d60304c359e527a2c43449/File/zovip.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/78213769232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=heatstar+propane+heater+manualPDF 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_off0000dfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCA 10516 bytes
SHA-256: cb3d4503983e7f40802aa0d3d5386ab9e6dd826fb8cd55321016f062fe5cc95d
font_01_sfnt_off0000f777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF777 17652 bytes
SHA-256: 13b708f4c410ad8df6e66f18386ed07d9ac73e85d5f067a322e93c2104481ec4
font_02_sfnt_off000124fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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