Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0440d64ad072fe2…

MALICIOUS

PDF

84.5 KB Created: 2021-09-15 15:06:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 53c17a2e9f28025469606f7d6741974b SHA-1: 8ec911e969b93495f5d3b7daeaf35a5d2bb8e5e3 SHA-256: f0440d64ad072fe231c34daeb1b31cded4b868025886818171e08b5c2212468e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to distribute malicious content or facilitate phishing. While no scripts were explicitly extracted, the PDF structure and URL distribution strongly suggest an intent to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://bd-sokolovska.eu/userfiles/file/56481819880.pdf In PDF document text
    • https://borgopitti.it/userfiles/file/kunofusem.pdfIn PDF document text
    • http://mvpbuilding.com/userfiles/file/63402026285.pdfIn PDF document text
    • http://jarauwerdaenzn.nl/userfiles/file/gawixerumizupipupa.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/dupok.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/xopoligugusibikufiba.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/39474821465.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/78101263230.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/74034668577.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/109833b31389deda17ffa98af1568e42/mavepebajepirajeg.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109061408447610.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/wewubaban.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/26321977239.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/41692350843.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64474278102.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/xudasokitila.pdfIn PDF document text
    • http://abwingsva.com/uploads/files/worosos.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/61566853983.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/56528257946.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/81053254921.pdfIn PDF document text
    • http://tangiahoang.vn/Images_upload/files/26364834556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=8+ways+aboriginal+pedagogyPDF 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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF1 17912 bytes
SHA-256: b6e7f066cc663ea34d52349e14764cd09a567b135816ea200085cf588cd0a4f9
font_02_sfnt_off00012bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD6 10920 bytes
SHA-256: ef8accab34025e559edb336f41784a4b6c8903056a160a67efeeddbc1b69ba77

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