Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df6a0c13479fafa…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 21:55:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 0a334e66b60dcab8ab76d557fc39c66a SHA-1: 8b1e0d63ddf69969721f0ff5ad09ee623cb91664 SHA-256: 3df6a0c13479fafa7021b1e06ffe5fe57ea11bbc34506245b911bc84391daad8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM suggests the document is part of a link farm designed to manipulate search engine results or distribute further content. While no scripts were explicitly extracted, the presence of numerous unknown URLs points towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://coastalholidayproperty.com/ckfinder/userfiles/files/82748229107.pdf In PDF document text
    • http://cee1968.com/ckfinder/userfiles/files/dejojixur.pdfIn PDF document text
    • http://sb-78.ru/files/file/35919456027.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/15675018653.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/repug.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/dovoguxeduvefozawaletites.pdfIn PDF document text
    • http://odumakus.com/uploads/files/7204627441.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/87286031271.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/61518357006.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/wovomaledevokevipibitelu.pdfIn PDF document text
    • http://www.louisianarebarcontractor.com/editorimg/file/jitizesimeja.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021091006252373499.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/kowigixavoto.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kiwivuseneveb.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/58283452510.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/36084484019.pdfIn PDF document text
    • http://rld-carbon.ru/file/susepixaxikafemififumam.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/rutujaduz.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/xonatuxebevepakonuru.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/tobixixilavikewoxegolopul.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/19261679642.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/41575384400.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/6793059905.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/88443011613.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/98029828012.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+emulator+ios+jailbreakPDF 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_off0000d765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD765 16816 bytes
SHA-256: 5a09cc72b336fa73e173a5abf4681279b0e87caf757db5da5d343bf156705848
font_01_sfnt_off00010342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10342 10852 bytes
SHA-256: 985bb512e7cd58655b30c9f3e52ee5d6cb7046ac8463b2726486180a018389cd
font_02_sfnt_off00011c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1