Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a7613cb0a6261e…

MALICIOUS

PDF

82.0 KB Created: 2021-09-12 22:24:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b004b264eaeaa1d8f9dfe4b339168569 SHA-1: d49be08e9edaf0c4ddaaea33f6b4be79d54e7736 SHA-256: a1a7613cb0a6261efb5e4f4d7a6f43cdd8fa150382d956b325805f29e5000b9f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates the document is part of a link farm, and numerous unknown URLs were extracted, suggesting a distribution or redirection mechanism. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used for malicious redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://jysfh.com/upload_fck/file/2021-9-8/20210908132023279118.pdf In PDF document text
    • https://hometeamcorp.com/images/usr/lijigewu.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/tegowenosixiragijoj.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/tedere.pdfIn PDF document text
    • http://shengnabei.com/uploadfile/file///2021090502524589.pdfIn PDF document text
    • http://dakhoanhanai.com/images/files/jubexewabazulikaraw.pdfIn PDF document text
    • http://meta-min.com/files/nimosorelig.pdfIn PDF document text
    • http://labradory.pl/file/83320963839.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/15249179957.pdfIn PDF document text
    • http://phuwangnam.com/user_file/file/wujuxerom.pdfIn PDF document text
    • https://villadorottya.hu/uploads/frontend/files/mimasubaxukujoga.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/duleperuvug.pdfIn PDF document text
    • http://langyupharm.com/upload/files/basufarikekutakodisav.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/sakujipejo.pdfIn PDF document text
    • http://ccshecea.org/upload/files/29373844407.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210906_182120.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/42148671132.pdfIn PDF document text
    • http://wyadonline.com/userfiles/file/rupivuxunovagunuta.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/dewip.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16136f7383cdd8---vozijowulodetij.pdfIn PDF document text
    • https://isosklo.cz/uploads/kuxodinebex.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/65652194864.pdfIn PDF document text
    • http://bibliotekaludwin.pl/img/upload/files/zixuzasuvarafoza.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/78117432461.pdfIn PDF document text
    • https://isagrinio.gr/userfiles/balefisupamuzifivitososop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=video+call+aPDF 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_off0000e0c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C7 9864 bytes
SHA-256: 2013eea0c67656baf7e85a8f7dedf02310a4daa205fdcaba08174419c6da1e59
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E9E 17000 bytes
SHA-256: 9ab65ea7e6a283b3422dc0f86d92d1185343d0aa517235e9f3f536d3c2ae2caa

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