Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d1c911a3004c1c1…

MALICIOUS

PDF

72.9 KB Created: 2021-09-17 02:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a43df1eda3bcc866e08c56a8db59c42e SHA-1: dad8b5cedeab1559afa0069dfe5dce7e020f7f45 SHA-256: 8d1c911a3004c1c142d988fceb99ff78995736b34fd6a24fb0e0846498bb02b9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://nomylo.ru/uplcv?utm_term=pmbok+6th+edition+cheat+sheet+pdf PDF link annotation
    • http://podarox.ru/public/files/10394552638.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/betudekewemopamesoneze.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/lifuvomonenofofitilixugik.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/wavolimemunimiruxuti.pdfIn PDF document text
    • https://snapstudios.ca/userfiles/file/25015441564.pdfIn PDF document text
    • http://suurelepa.ee/data/file/16689097665.pdfIn PDF document text
    • https://xcheck.vn/uploads/userfiles/file/tarexifonafa.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/ruwipufipabimusigukumonil.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/tebuta.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/33052333998.pdfIn PDF document text
    • http://www.schule.havonix.com/ckfinder/userfiles/files/66770945525.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/29162751825.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/pijejotidubo.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/povuwonokol.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/161336aee6b20b---mubum.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/4bf30b727848bbcf33a78996d8db3169/36393185756.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/widapojigoteg.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/88018093268.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/57631143451.pdfIn PDF document text
    • https://ichibaninfotech.com/ckfinder/userfiles/files/58849659561.pdfIn PDF document text
    • http://grafosaleservice.cz/images/fck_editor/file/tapuzuwefotalavini.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/gobovewimomagosefutuso.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_off0000b894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB894 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A6 16868 bytes
SHA-256: dab40a0035c059a34d8277e67d018f68bdf81742f64e9dc39de456f7c6f12751
font_02_sfnt_off0000fc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC48 11140 bytes
SHA-256: e11378cfc6a4ef6eef8f5ad3bafe6af4f715754763ddcd21c44cfde77fc2f3e8

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