Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e61c6b84f3b064f…

MALICIOUS

PDF

85.8 KB Created: 2021-09-17 23:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2a65b5f37b665c124c3046419849417 SHA-1: 4e9e569d6c2c8ca0be90229391d098e07f83f897 SHA-256: 4e61c6b84f3b064f0473fd1152932d8e646d763f47bed9eb69d344a153e9d634
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is described as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://philabc.ru/uplcv?utm_term=andro+code+scanner PDF link annotation
    • http://mtkshop.com/images/uploads/file/8946738589.pdfIn PDF document text
    • http://djapm.com/userfiles/file/mubado.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/kigubisigeder.pdfIn PDF document text
    • https://alev.az/userfiles/file/9351870693.pdfIn PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/pazeropimivedofefegupaf.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/resutajeta.pdfIn PDF document text
    • http://www.polni.si/Images/files/bitaxusezopasal.pdfIn PDF document text
    • https://nilsahost.com/calisma2/files/uploads/sawajuwul.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/68151344762.pdfIn PDF document text
    • http://hiroi-es.info/yamituki-n/uploads/files/4938097479.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/mezeruxakufevujotasizu.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5333ba9a0---povafoluvorimetejonul.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210907020014.pdfIn PDF document text
    • https://yellowmangocafe.com/userfiles/file/jarolisafofiz.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/30861278810.pdfIn PDF document text
    • https://ohcsi.com/ckfinder/userfiles/files/xisow.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/xizasirabebezajobule.pdfIn PDF document text
    • https://brillimet.com/uploads/files/202109121456053818.pdfIn PDF document text
    • http://minerva-collection.net/files/files/tojunuvokizonapebaxo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/ledazonitilufuxijet.pdfIn PDF document text
    • https://pcetravel.com/files/file/rokusaxosuxesorulum.pdfIn PDF document text
    • http://khachsandomino.com/hinhanh_fckeditor/file/12776122998.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139616ddcc33---kuzizasak.pdfIn PDF document text
    • http://mq-water.net/upload/44089971951.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/xujavu.pdfIn PDF document text
    • https://dudikom.pl/userfiles/file/40638420800.pdfIn PDF document text
    • https://powerliteaac.com/userfiles/file/zowifapasuvifejupuzija.pdfIn PDF document text
    • https://www.marjojaspers.nl/ckfinder/userfiles/files/neradutegopi.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_off0000ebbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBB 10108 bytes
SHA-256: d7c17e5ebd5660f7b80ce6c30a06bf57980342301903062a7d74aecaeb38910e
font_01_sfnt_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 18044 bytes
SHA-256: 1d956420712d08245f20e46bf827afbb90649e4497a484fe96ba7a6189a79898
font_02_sfnt_off00013155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13155 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1