Malicious PDF — malware analysis report

Static analysis result for SHA-256 45aef685c51ff85c…

MALICIOUS

PDF

80.3 KB Created: 2021-10-05 14:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0e341f1a2c4b941506d24381b16069dd SHA-1: 7767e425694841ce82680508c64b665367119234 SHA-256: 45aef685c51ff85ce6857be52e2d98b281a0865b4ba978d4e231bc251d881434
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected by ClamAV as a phishing trojan and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, and one heuristic indicates it's a link farm. The PDF structure and embedded content suggest an attempt to redirect users to malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://chicopharm.com/upload/files/golosorapaxuxug.pdf In PDF document text
    • http://makrostal.pl/user_images/file/37050679846.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/tuwilotapasitukujowodisif.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/50086986243.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/1233812289.pdfIn PDF document text
    • https://siroyensao.com/upload/files/34701296668.pdfIn PDF document text
    • https://norservis.info/files/files/57065967652.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/dosagidarowurebik.pdfIn PDF document text
    • https://nurdagihaber.com/resimler/files/tofawaribuzosir.pdfIn PDF document text
    • http://marktoby.com/akram/know_news/admin/userfiles/file/mowujosatexetuvozokibonob.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/52767504296.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615278550480b---fawogorekeroma.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210911202314.pdfIn PDF document text
    • http://offerparts.com/upload/files/28918606411.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/gemosuxapoduxi.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210922212351.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/tomotikux.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/xopurodanupodiduvexefo.pdfIn PDF document text
    • http://nb-magnet.com/upload/files/48367217157.pdfIn PDF document text
    • http://lovelyspa.net/ckfinder/userfiles/files/4846202901.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/40779847604.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161455bb44c0c3---77470247872.pdfIn PDF document text
    • http://hk-sai.com/ckfinder/userfiles/files/nuxegoxoxonolekibamulu.pdfIn PDF document text
    • https://gcr.goldcrownresort.com/magazine_files/files/30042341037.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lateral+flow+home+testPDF 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_off0000d74f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF61 17264 bytes
SHA-256: 1d51474d621c26e0f6d73d148d06b42ede88054f9391964ca6b712c918f93813
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10328 bytes
SHA-256: 85d039df9b9743343c1c754e7d744d661eb1534880eecb16ed1522d8d4dace6c