Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcf4ab4edf211599…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27035a4c0b027ddcf61d159a2fba85d0 SHA-1: c8c4f6c379940b87b35d0ec629c9ec7cb148861c SHA-256: fcf4ab4edf211599a0818cb7775f01b91ece659957d6169bb676754649184396
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with high confidence. It contains embedded JavaScript and numerous external URIs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of embedded JavaScript indicates an attempt to execute code, likely to redirect the user to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://stop-remont.ru/ckfinder/userfiles/files/fulidova.pdf In PDF document text
    • http://www.santabriganti.org/admin/ckfinder/userfiles/files/18959562130.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/sikegapedefidejo.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/jefivik.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/4540486582.pdfIn PDF document text
    • http://kovovyroba-nosniky.cz/UserFiles/File/81502390617.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141626db2a2e---fidofewenozafominipetezaf.pdfIn PDF document text
    • http://tuhocxuatnhapkhau.com/uploads/ckfinder/files/nivofalotamusilifodo.pdfIn PDF document text
    • https://nieruchomoscikomercyjne.co/files/file/13355965496.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/luvegipazafilurazadikimow.pdfIn PDF document text
    • https://fundacjanadzieja.com/images/wyswig_images/file/79761434102.pdfIn PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/sotokuxovijujux.pdfIn PDF document text
    • http://deforma.it/userfiles/files/11629040442.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141337d10ee0---dogigiresujedademu.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/file/sepofofameruzev.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/48383538324.pdfIn PDF document text
    • http://costanzolegal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bobarobixifisovo.pdfIn PDF document text
    • http://decaiyun.com/upload/file/21090816385694104981insir4d672.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/nenage.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/4261915135.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/zarusitexebufomuvinalu.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/76713667089.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/poropozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=korean+phone+gamesPDF 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_off0000ba0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD221 16860 bytes
SHA-256: 2499367761ae3d84f53ed9d1a1a36b4acdb68e60872077721f609bd6611af9d4
font_02_sfnt_off0000fd0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0C 10452 bytes
SHA-256: fc05960c01c54acc20491c378765d84631c6c4539b9e8f15271086298fd14020