Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8171caaec3c57b8…

MALICIOUS

PDF

85.6 KB Created: 2021-10-22 13:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0028cc30a188dc6550f684494f6aba98 SHA-1: dbb2ea32f48ec88c0d7bb0ad4a17a604e74c1918 SHA-256: f8171caaec3c57b8392ede75f63e6d7a0661cc76a19e0b9f4a55ac684d7bd850
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a deliberate attempt to create a deceptive web presence, likely for phishing or distributing further malware. No scripts were extracted, but the structure and heuristics strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://middletonchambers.com/ckfinder/userfiles/files/vefuwonelapikobomodo.pdf In PDF document text
    • http://plnjl.com/userfiles/files/24908750452.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/54834108070.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pinexoveki.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/lejij.pdfIn PDF document text
    • http://www.solarwindependence.com/ckfinder/userfiles/files/kukif.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/totinobufuji.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/21403125380.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/nexovigeleparijaw.pdfIn PDF document text
    • http://houselandia.ru/files/22424192361.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/13441675748.pdfIn PDF document text
    • http://e-baze.lv/images/site/file/91851415931.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/vuwadozefubuvu.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/kuhj3tptn4kvuvu19qnd58mos4/zosigokudi.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/zoborobofev.pdfIn PDF document text
    • http://dasbluemchen.com/xexuzazarededova.pdfIn PDF document text
    • https://matrixx.lu/images/wenivudorasupitonurodu.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/16828413892.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/45133253186.pdfIn PDF document text
    • http://goodwill.pl/userfiles/file/pipazen.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/nelazega.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/69948031051.pdfIn PDF document text
    • http://www.autodesguacecoin.com/ckfinder/userfiles/files/novadixalifozek.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/zazevutekumibinofelapop.pdfIn PDF document text
    • http://przystaneknida.pl/data/aktualnosci_imgs/file/46244942114.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=all+about+artificial+intelligence+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_off0000e891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE891 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A8 10848 bytes
SHA-256: 2e64f6e7bfcbcc31c8861e5085a04460ea16e0211e17dc8728150c803f310f6b
font_02_sfnt_off00011963.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11963 18280 bytes
SHA-256: 0c14c8a797f114d8179b48e9cb96066b8805b2e69ab3424501e109ce18e84393