Malicious PDF — malware analysis report

Static analysis result for SHA-256 06d8c211ffa3c5a8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-18 21:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 76ff06ebc121d474bd45bae5caaada40 SHA-1: a8888f82890f4edf42df3b2771d799612897e75e SHA-256: 06d8c211ffa3c5a836ce4751610478b34721ad174d638e980ab8453af908afc3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to distribute malware or conduct phishing. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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://koltoztetes-szallitas-lomtalanitas.excore.hu/ckfinder/userfiles/files/30764457936.pdf In PDF document text
    • http://rlmlaw.com/images/edit_images/file/vavimamudeziwodekatutuvep.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/tevefofunobifubigowizix.pdfIn PDF document text
    • http://salt17.com/userfiles/files/gigivibol.pdfIn PDF document text
    • http://nt-module.ru/ckfinder/userfiles/files/majisexufotub.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/60793110974.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/24353090731.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/zazokevoxovojo.pdfIn PDF document text
    • http://zjbfjt.com/upload/files/65618046320.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/wijigopewumasufewe.pdfIn PDF document text
    • https://negaratoto.com/contents/files/fuwagurabifafimazodu.pdfIn PDF document text
    • https://nusantarabet4d1.com/contents/files/sukijegedibaxu.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202191217353186.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/zabegidirepebagopide.pdfIn PDF document text
    • http://moveworldtogether.com/datas/files/53121576508.pdfIn PDF document text
    • http://slbreakingnews.com/ckfinder/userfiles/files/49579287419.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f224f63683---bozevulosirapisezavoliba.pdfIn PDF document text
    • http://hortherbpublisher.com/files/upfiles/file/sovata.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/xuwukivotalozokaxis.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f2fab5c4---mokifizik.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • https://playworkspartnership.ca/sites/default/files/file/wokakifajesirosokafeli.pdfIn PDF document text
    • https://casabresciani.it/uploads/file/ruvififovewewu.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/fopoxafijetupajakibaseg.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/43960172583.pdfIn PDF document text
    • https://speakingparrot.com/upload/ckfinder/files/72886910088.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=naruto+shippuden+112PDF 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_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 20152 bytes
SHA-256: 47cff7e14051a7f84bc044edf2b5bd0115071a873152c35cff30a4e874a793a3
font_01_sfnt_off0000f823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF823 10692 bytes
SHA-256: 98d2973fd9195ada955346cdfb3815a79f7a2d10e78b1bb576a7fb2a418e7198
font_02_sfnt_off000110b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1