Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd49b6027921b18…

MALICIOUS

PDF

91.1 KB Created: 2021-09-09 15:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 95cbfbd142f70d28b3e812e1c2782860 SHA-1: aaf174c7733143924817b7f081bc533060d9a94a SHA-256: 3fd49b6027921b182b7f91ea91af0c7126bcb8072957a9400b31d6aba49ddeeb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to PDF files on different domains, suggesting a link farm or SEO abuse. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these linked documents. The presence of embedded JavaScript further supports the potential for malicious actions within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.assofmt.org/ckfinder/userfiles/files/zozaziwopizofibewujag.pdf In PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/43962637949.pdfIn PDF document text
    • https://portecitadelle.portecitadelle.ca/ckfinder/userfiles/files/85497379734.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906164818.pdfIn PDF document text
    • http://35ct1.com/images/ckImageFiles/files/39001959353.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/18798017823.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/36770028041.pdfIn PDF document text
    • http://119pump.net/d/files/15793651107.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210904_7CA2FA9C7AFDC897.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/jajulerutixexevimat.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/58363906840.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/61264990258.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/sunesatutilazemagisedaz.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/famezodowolotekajeset.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/jepewizusixelasimeritev.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161354afd1615e---21700144023.pdfIn PDF document text
    • http://freetds.net/userfiles/file/6192950783.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/59059567724.pdfIn PDF document text
    • http://advairtech.eu/assets/userfiles/file/liwadolezifagazabudumu.pdfIn PDF document text
    • https://nstoplana.rs/ckfinder/userfiles/files/92016154455.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/27164971898.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/6392709639.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/76987012221.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/files/misizobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=puffin+para+androidPDF 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_off0000fe32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE32 10148 bytes
SHA-256: 2d8077af4bca41e55df4669918b1c7d457c3dd2750c95c91aae8e9e565511bfb
font_01_sfnt_off000114dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEF 19060 bytes
SHA-256: d90c096e94b27471507072307b9f4345e9325cdc79164638bb2680c9fc620d16