Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f9dd46f037db52…

MALICIOUS

PDF

83.8 KB Created: 2021-09-10 14:52:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 53d078c5a021b63721fd52278267bc70 SHA-1: 017d186aefffbfc2a14c15b572205dd04798642d SHA-256: e0f9dd46f037db520813c203e776a3cb3c63c0394d8ab8f655efd0347fae91eb
126 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to other PDF files, indicating it is part of a link farm designed to distribute malicious content or phish for information. The authoring application 'wkhtmltopdf' suggests it may have been generated programmatically for this purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://strandedtattoo.com/file/bidizazamir.pdf In PDF document text
    • http://kppzp.pl/userfiles/file/25859956441.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/8714339810.pdfIn PDF document text
    • https://pecintajp.com/contents/files/7128577704.pdfIn PDF document text
    • https://giyimkent.formenemlak.com/upload/ckfinder/files/zolilewejebi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d9f409b8a---58199748670.pdfIn PDF document text
    • http://cycling-software.com/files/file/nilabedumovipusefejakavar.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/kurogizokopivexufejoduzev.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/tiruwukevogojebak.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/2603297360.pdfIn PDF document text
    • http://somersetcountybar.org/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/41383499400.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/dipuvujanodadagagopidodov.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/wawolekebetofogax.pdfIn PDF document text
    • http://dreptultau.hotnews.md/upload/userfiles/files/83162277945.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///bovuriped.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161301849e2d88---51978682514.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/bubosoxurapiwoz.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/zezobemigebiwagoxovepuke.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/67816578289.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210910150308_a0ctk1.pdfIn PDF document text
    • https://cargoservice.pl/cargoservice/userfiles/file/71098805290.pdfIn PDF document text
    • http://metrominicabs.com/survey/userfiles/files/vifom.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/patuxuten.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fill+up+free+load+unlimited+points+apkPDF 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_off0000e169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE169 10828 bytes
SHA-256: 5fecd7a59854ae1877780b29ab732a8adfbca2683680c18a7fb47d167a629928
font_01_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 17820 bytes
SHA-256: 5d290923c9a7c9fa270d7e0d969be2bf5ba7675e00eae236e3e40eb683df8d94
font_02_sfnt_off00012915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1