Malicious PDF — malware analysis report

Static analysis result for SHA-256 c17e4325abf03472…

MALICIOUS

PDF

79.7 KB Created: 2021-09-22 22:56:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ed50fee8b1d3444aa6fc41728ce68b7b SHA-1: b7a98a16f7eaa234da40dac0af1a4053c1be6b10 SHA-256: c17e4325abf03472d6635a885a5e23c0160e5c39c796ad42ab52a0ec5ad1df0a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of embedded links pointing to various domains, many of which are likely disposable or used for hosting malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://kemnhapkhau.com/upload/files/sozosewuwixamiredoxi.pdf In PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/81567274826.pdfIn PDF document text
    • http://joyerialaplaza.com/ckfinder/userfiles/files/64318821378.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/mujuvekarapinopitupit.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd6d3db101---48015568794.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/73587108195.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/76095113122.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/vebifavajolobolitamuj.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210914131210.pdfIn PDF document text
    • http://ymmicro.com/files/files/rabolizezaromomafipi.pdfIn PDF document text
    • https://dnmpaint.com/sdcc/images/file/siperoramemivonu.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/mexufir.pdfIn PDF document text
    • https://terracell.pt/images/file/12235087489.pdfIn PDF document text
    • http://tsuiteru66.com/userfiles/file/94383625026.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614104448312b---sabutudowulu.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/55439773692.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/vexinoxerutavaraxijixi.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/refufabeposugelas.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/39886555677.pdfIn PDF document text
    • https://casaalu.com/luutru/files/makupifejidujelolinurezel.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/8841945599.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+set+html+text+in+textview+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_off0000c760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC760 18736 bytes
SHA-256: 42b4b2260bc584949bac33f6077ebdc19577a1f5167074129cb5b53587a7f827
font_01_sfnt_off0000f8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B0 13348 bytes
SHA-256: b31d7f9c16520c873f2b9677be875d8e79ab6a2edac2a47b16ee9f8ac9300bca
font_02_sfnt_off00011983.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11983 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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