Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4489698988843d5…

MALICIOUS

PDF

81.8 KB Created: 2021-09-11 09:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bd2206aed764979df29f271dec0eb589 SHA-1: 0fa381ae0e232933c78e7dac04f5c600f416816b SHA-256: b4489698988843d52f97bedad81ed78f9937a8b1e7c159c2f3dcd85987705635
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various PDF files hosted on different domains, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://lompatjauh.com/contents/files/pexetowal.pdf In PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/93711729363.pdfIn PDF document text
    • https://rajakeempat.com/contents/files/sukapitegilubegi.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xuvofapobidugebeful.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/87874489202.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/98271614128.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/9302766541.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/53733400769.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/wofaxo.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6b3367e4f---dezoxixipixilojivudor.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/wujuraxesunolujoginejo.pdfIn PDF document text
    • https://farmaciasacoor.com/site/upload/file/34683674164.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/58329207943.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/2455457045.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/wojatevofep.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134c1a3df7d8---nosifajadejar.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/rimowixaxovizizazevuw.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/jobitujibefisoku.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/45850262872.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/6845103995.pdfIn PDF document text
    • http://nakajima-ya.com/upload/save_image/files/46960464443.pdfIn PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/90817983788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=hd+cinema+apkPDF 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_off0000da79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10228 bytes
SHA-256: ac5ce5d4d1ff0c427b2ea374280b5a9b21808b875e5c5c2a81657f5b8be6c537
font_02_sfnt_off00010962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10962 18704 bytes
SHA-256: c15b5fb07d9e5250a16e6f38452fc18c933ec78dc74a3147409be4da42a75555