Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a5e72320fd97596…

MALICIOUS

PDF

76.4 KB Created: 2021-09-09 01:03:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca52ba025802f33bac972ab9d3dc3bf5 SHA-1: 3571fd5c33283914543e554706571a0cf4dd4a61 SHA-256: 2a5e72320fd97596d479de245ca97af345d9b0a3dd7d44910cb06e25f8ee64fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://drafthe.ru/uplcv?utm_term=free+ram+apk PDF link annotation
    • http://fastcredit.ge/userfiles/file/26382243418.pdfIn PDF document text
    • http://klccpa.com/userfiles/file/gugebaze.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/6124796068.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132030e07d7f---jezosijupu.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109080802165563.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/vijoxowopisupuxe.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/76706643255.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/4117259177.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mitodesesikowevilegidare.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/29409912285.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/wavakanegedijegafut.pdfIn PDF document text
    • http://paoladebenedetti.eu/userfiles/files/49238066840.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161301e5b84052---53604282708.pdfIn PDF document text
    • http://enricobarraco.com/files/xifuweko.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/25165886205.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/45462449.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/82232224984.pdfIn PDF document text
    • http://www.singchai.co.th/ckfinder/userfiles/files/40534727911.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907174927639252.pdfIn PDF document text
    • http://farmandari-sarvestan.ir/images/news/files/rarawageroxusogakonovanu.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/42323906462.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/katujumizo.pdfIn PDF document text
    • http://gzhangqin.com/uploadfile/files/nawigukoxep.pdfIn PDF document text
    • https://digireg.org/upload/kitubalidosurirelojovas.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_off0000c6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6FB 18380 bytes
SHA-256: 5958f5bfe73ddd7a681a60e6f9062feb50fe0d3179fb607f4d4f9832e95f3d41
font_01_sfnt_off0000f64d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF64D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E63 9852 bytes
SHA-256: e51c27f1a871474ff1041435d7642d7cf940d4e41c386fe9ed6539d06fc6a016

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