Malicious PDF — malware analysis report

Static analysis result for SHA-256 999f715544627c29…

MALICIOUS

PDF

81.9 KB Created: 2021-09-18 07:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1238fde3be70ce17b967c269bb55a98e SHA-1: c4555f2dbcd34c2e35afa1a685c7e012d85b9b92 SHA-256: 999f715544627c298626ede227c4dd2b0d1cd04a9853db8354bc1d09e4a9a1d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to potentially malicious PDF files hosted on various domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a link farm strategy, suggesting the PDF is used to redirect users to a large number of external sites. No scripts were extracted, but the presence of external URIs and the link farm heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://sahcarpets.com/userfiles/file/93708024251.pdf In PDF document text
    • http://divorcefinance.nl/uploads/file/76258410652.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/49978166137.pdfIn PDF document text
    • http://belv.ru/userfiles/file/zadinesodimigugumiw.pdfIn PDF document text
    • https://cuichi177.com/uploads/files/202109121314197271.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/95435036104.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/16134c4a972961---mifogusok.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/namurefa.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/11623176711.pdfIn PDF document text
    • https://wittnebel.dk/file/jevinusoxigufu.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/3481159869.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/vegisezi.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/mupupatelamidazu.pdfIn PDF document text
    • https://kaunas.cvzona.lt/resources/img/files/xuvepowuvemifil.pdfIn PDF document text
    • http://hak-al.com/resimler/files/jipikuwofaf.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/ragelugurafoxizu.pdfIn PDF document text
    • https://edex.co/userfiles/files/86096964538.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/pubiresusoluwupoloxib.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/nuxerumisadokavive.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/11491905356.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/70653724852.pdfIn PDF document text
    • http://cuacongtudongbinhduong.com/upload/files/kelodolijexitibilosuzixi.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/47679816846.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131d6bf6ccb0---jodapapenapotejideg.pdfIn PDF document text
    • http://horvathortho.hu/tmp/ripugazun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=move+app+to+sd+card+apkPDF 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_off0000dc6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47C 17652 bytes
SHA-256: 8e6b3cd92cc2d5ee5325ca15af26677ec1f906d7d77ee7788f564aecc83e2750
font_02_sfnt_off00012251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12251 10416 bytes
SHA-256: 87030fee82864dadb620e043cee01ad9fd616a6ffa7c30c052d244b8ab2b1639