Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c22743f87278812…

MALICIOUS

PDF

92.3 KB Created: 2021-09-10 21:01:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 092ab21f63b7dcfb5d30fe4bf4e1c230 SHA-1: 0cad5c9cb8ccb2d876e41941cbeb8db949100f00 SHA-256: 6c22743f872788129b499ac8982a1ab06f9b40247a4bfb5eb51316be59863014
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 5

  • 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.
  • 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://rt-totaalafbouw.nl/userfiles/file/31529633901.pdf In PDF document text
    • https://sofupingame.net/calisma2/files/uploads/53957897167.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/navafaxuwep.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210908_0F5A397EB4BA6E47.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/94145879347.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/kiithto2sgj1gh03g82f586iv8/ribunepefogekek.pdfIn PDF document text
    • http://winkeleninzundert.nl/uploadimages/files/giligilafojipil.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/94619866060.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/38936866928.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/96746103105.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109041145061648.pdfIn PDF document text
    • http://cambresisemploi.fr/ckfinder/userfiles/files/jelatubad.pdfIn PDF document text
    • https://www.area-tlc.com/public/ckfinder/userfiles/files/tokixesanazonojej.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/kipejitewuvobigaditaropev.pdfIn PDF document text
    • https://cahayaapi1.com/contents/files/35379552081.pdfIn PDF document text
    • https://2acontractor.it/images/file/zusetagazipekuvego.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210902054413.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/robipirizagasoz.pdfIn PDF document text
    • https://cartolmania.it/file/lirejorujidodesudavusu.pdfIn PDF document text
    • https://www.savininkai.lt/ckfinder/userfiles/files/vusuze.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135886310bbc---junejugewarazutatuditus.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/92196552864.pdfIn PDF document text
    • http://plise.org/userfiles/file/71917575140.pdfIn PDF document text
    • http://metabolit.ru/files/file/sogika.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=linda+goodman%27s+relationship+signs+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_off00010153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10153 18712 bytes
SHA-256: 3c7e5d43bf7542411018c3b22e685213d1960ec4fc78f7fce46ed03a46cfa5c9
font_01_sfnt_off00013207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 10936 bytes
SHA-256: 28baa9df2cf9e47c45e97e7e866fcb31d9ca887fc2eff9c0838c67e6e29bbb00
font_02_sfnt_off00014af8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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