Malicious PDF — malware analysis report

Static analysis result for SHA-256 4371e0f0cb34a8b1…

MALICIOUS

PDF

73.8 KB Created: 2021-09-18 22:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91d95c63efeef6fef31e852e6aaeb23f SHA-1: 67bd1e8aab4d4d21f269a366380d41035b7b4f6d SHA-256: 4371e0f0cb34a8b190b2cc50ebfee7b84b6600b59afb6e1fa838cf5f903e5f8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or malware distribution lure. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. While no scripts were directly extracted, the PDF structure and numerous embedded URLs point towards a malicious intent to compromise users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://atputasbazes.lv/images/userfiles/files/nezewilekemimuvijuzibutu.pdf In PDF document text
    • http://fxlcd.com/upload/file/51750851371.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/muzibakufumileza.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/58140010137.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/73337244689.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/sozilazedirajil.pdfIn PDF document text
    • https://pokereshop.cz/data/file/topuketolipun.pdfIn PDF document text
    • https://wilocom.ro/ckfinder/userfiles/files/rilulitexegakurugerojudit.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/3ccf3970f8c1535b66e479b9a0393d15/37242027411.pdfIn PDF document text
    • https://datenglagi.com/contents/files/kedoxutoluruvexewaderemu.pdfIn PDF document text
    • http://rwdwebwebdesign.com/img-aim/files/62013962731.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/sazivetas.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/zafuxim.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/texexej.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/19091363406.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/vudojinagoxigapefonele.pdfIn PDF document text
    • http://www.luna1956.com/images/library/File/78505455504.pdfIn PDF document text
    • https://noithatkuongthinh.com/uploads/files/linuwab.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161370ecd4c7f7---dowoj.pdfIn PDF document text
    • http://ain.proximeo.com/ckfinder/userfiles/files/vukamodamunadupafil.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/39458426804.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/fapexojajujujoxunobakom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=cast+of+movie+the+shooterPDF 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_off0000bdf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD608 17064 bytes
SHA-256: e3a50d3ca987b1b4f311b9f6c720e0a67c97a5848bab5b89f3715d6ed7647481
font_02_sfnt_off00010213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10213 10428 bytes
SHA-256: ba10fbd2fa5770a60a66fee47edf91f077cc8cb13554c0d22c9e26adacc0ffc2