Malicious PDF — malware analysis report

Static analysis result for SHA-256 de46b2f0e9c6cfac…

MALICIOUS

PDF

76.8 KB Created: 2021-09-25 17:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d84ca4ad3bda87bab7e4c95f2231e288 SHA-1: acccfe59327908b1c4411f630114a609f24c069f SHA-256: de46b2f0e9c6cfac88395f8e139d4a55c250a66abb22e43349610bbd7549c786
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm or phishing infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://smidgel.ru/uplcv?utm_term=outlook+android+notifications PDF link annotation
    • http://boldogelet.hu/media/35853579762.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/sakun.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/77707417271.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/dutafoka.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021092020541246.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/pulovajosapu.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210920022311110.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/jaduxukitawuzutapanutu.pdfIn PDF document text
    • https://nhuadailoan.vn/upload/userfiles/files/86762878011.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/53e8924e42fe6f516ad2ce74e9be0ae3/7865261863.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/pogatenonuxibimazere.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/44880210572.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/4ba257adde15c96f5bca369c1b986fd2/82017042449.pdfIn PDF document text
    • https://davnosti.ru/upload/dokanajuvavufawaponi.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210923164350.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/pufafawexab.pdfIn PDF document text
    • http://sarkanyhajo.hu/files/file/34439428717.pdfIn PDF document text
    • http://partnercable.com/files/57919268801.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/78161124800.pdfIn PDF document text
    • https://orcasproje.com/userfiles/file/55403830771.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/48562531258.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/latuzamedegunejelin.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/fujifikulubanetaguvoboze.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/sijegiramudejokuru.pdfIn PDF document text
    • http://3qlohas.com/CKEdit/upload/files/zanizulovagikoxew.pdfIn PDF document text
    • 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_off0000c0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AC 20180 bytes
SHA-256: 505d6b3d3915540fd04a6a077c969f533dad8168326a7b5163a8c39fed8dee69
font_01_sfnt_off0000f4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF3 10556 bytes
SHA-256: f025649e2fa17ed056efcb55eaac0ef844fbbc7eb385fdca78934be649942570