Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36e773865b65cf8…

MALICIOUS

PDF

82.3 KB Created: 2021-10-04 15:29:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 64c0cebee06527531f223e955e60a43a SHA-1: 5f6b958fa6b79d60c9d9c630f6b8467f47097333 SHA-256: b36e773865b65cf86d888798cf63106ecdfcdf134b730ef5981536cb12fd3f02
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the assessment that this PDF is designed to redirect users through a series of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://astorandblack.net/emailer/userfiles/file/49418035853.pdf In PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lurenoximedekopulume.pdfIn PDF document text
    • http://becucci.it/userfiles/files/63567101139.pdfIn PDF document text
    • http://xn--90aoa5aj.xn--p1ai/ckfinder/userfiles/files/wonupowewijezaxapeg.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/tepapot.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/423527499.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/lumopebokapajidixopok.pdfIn PDF document text
    • http://dreamsurgeryen.net/ckupload/files/bomufoputoba.pdfIn PDF document text
    • http://roletyhanarol.pl/files/file/segunulewumewuxawaga.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210910054348.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210925114529_wgyutc.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/hduks5ll763kqf3f11lnchccq1/sufuvaros.pdfIn PDF document text
    • https://mimpishiodua.com/contents/files/wagogakones.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16140b7f3c6690---16249868782.pdfIn PDF document text
    • https://ritascreation.com/userfiles/file/38359150205.pdfIn PDF document text
    • http://spellenindex.nl/images/uploads/52567745162.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/49463728114.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/telonasexolemolajosi.pdfIn PDF document text
    • http://studiotecnicomancini.eu/userfiles/files/15805476814.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/lufuzabemegamafijoduwad.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/sesulodifowuborivanimunu.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/modomidimosiwafedo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=diffusion+theory+of+communicationPDF 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_off0000d8dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F3 10768 bytes
SHA-256: 5c69affbb85bdf756f3ccc32e7a7599e3ee0f4e52036da22769a8bab0c2ab4a1
font_02_sfnt_off000109a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A1 19388 bytes
SHA-256: f33775b1d50e4d7f82df002dea126168690150fad7d050dc1ebd5890003c181d

Open this report in the interactive analyzer, or submit your own file for analysis.