Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef50634acf28e64…

MALICIOUS

PDF

69.8 KB Created: 2021-09-25 16:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 03dba24cbcb09401bbd6f1d75811112d SHA-1: 1290b0ed5367156035d4a075f60d8adcc0a297c3 SHA-256: 8ef50634acf28e642dcfaa46cb617d611d32efe49fefb2328ce17af71dbb6775
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or redirection scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving directing users to potentially harmful external content.

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://vodova51-53.cz/files/62224952352.pdf In PDF document text
    • https://tipresentoio.it/images/file/98788874458.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/78329783318.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e394144b2---faxumaje.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/39423990446.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/vegazomigumerifufarerap.pdfIn PDF document text
    • https://medtek.vn/storage/file/40611357611.pdfIn PDF document text
    • http://zerosquareonline.com/file/44356073403.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/wumogunugezumuzamiluror.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/pelazefibewezuxozo.pdfIn PDF document text
    • http://ecole.ru/text/images/file/79254221831.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/lefuxowufevugepipomu.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/32171637451.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/db921fc7c1b7318d518a514a262a4aa8/fovaz.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/sokul.pdfIn PDF document text
    • http://avsa.org/sites/default/files/images/files/58086362034.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/zetejunafumitujijulon.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/54653743351.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/48029596279.pdfIn PDF document text
    • https://aodaixuan.com/app/webroot/upload/image/files/gegaxusejusad.pdfIn PDF document text
    • https://pokereshop.cz/data/file/bapuni.pdfIn PDF document text
    • http://fsnmmaterials.com/UPFILE/userfiles/files/2463154068.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/botazabemuji.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/11769089687.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=hack+coin+dream+league+soccer+2019PDF 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC5 11260 bytes
SHA-256: f17e93216684fc18badc8b8b2c72493a0d980c81064d389748d70c50784c8156
font_02_sfnt_off0000e505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE505 14532 bytes
SHA-256: 5f9462b63add852f43d0845b8c1d3b7737550bb67661a0493f9ec1519b9df010