Malicious PDF — malware analysis report

Static analysis result for SHA-256 191a7e2c8caa91ea…

MALICIOUS

PDF

73.7 KB Created: 2021-09-09 14:53:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9a65b66be9bbbea37535437eb05a9ebb SHA-1: 0e10a27321df308ecbab0b87a94fa8a6e7503415 SHA-256: 191a7e2c8caa91ea94a6f8d5dca57e1f151b0fd8ba0141779762e1b0ea0584b1
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. Heuristics indicate it functions as a link farm with numerous external URIs, including a suspicious one hosted on 'handylover.com'. While no scripts were directly extracted, the PDF structure and heuristic firings suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://aesg2edcv.handylover.com/upload/files/6087805591.pdf In PDF document text
    • http://popeyebio.com/upload/files/xejidapamibunaluga.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/18011321966.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/wuwozuda.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/kuzunewivuviti.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/wizawuluzifaxilurekebezu.pdfIn PDF document text
    • http://vucert.vn/uploads/files/kidosupemixoda.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/48817108371.pdfIn PDF document text
    • https://atlantidegattico.it/file/samilobukanupuredusir.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/dusofuwukagib.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/zidafetokisuraxetaximet.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/jekonukifoj.pdfIn PDF document text
    • http://losmarinoslanzarote.com/marinarubicon/admin/file/boxojowisobirefurekavosoz.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/fubekegi.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/jorusugak.pdfIn PDF document text
    • http://abarappresentanze.it/userfiles/files/lisexezarurovugatap.pdfIn PDF document text
    • https://anne-berger.de/sites/anne-berger.de/files/fkcfile/loxesimetudiwe.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613505ed66033---lazidebemujo.pdfIn PDF document text
    • http://chrisnoblelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sijuwanunigabuxovabebaker.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/zidado.pdfIn PDF document text
    • http://www.centrosanmarco.eu/img/news/files/tojodamimazo.pdfIn PDF document text
    • https://podgoricki-klub.me/userfiles/file/8970208162.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9ed9efccd---67106000300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=apk+gamers+offlinePDF 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_off0000bb68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB68 17788 bytes
SHA-256: 77873aa9bb0b9d0aaddc32225bc70fa62ee55c5ffe3dedd7bfa9659eb7795290
font_01_sfnt_off0000e980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE980 10676 bytes
SHA-256: c4b0509dd5f6897419d17f3cc6e5a60d6b743d59a9867614be5560bd005751f3
font_02_sfnt_off000101fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1