Malicious PDF — malware analysis report

Static analysis result for SHA-256 28569c1bdf3f3d06…

MALICIOUS

PDF

101.7 KB Created: 2021-09-15 11:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e98a10b52eaefd3b8e34c55c528ead72 SHA-1: d0c099bf15a11beb3ed9673071b66f0ca0745900 SHA-256: 28569c1bdf3f3d062cf44aaa884a69ba3be4c9487d6320293ed16e5ccc999988
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external websites, many of which are algorithmically generated and hosted on disposable domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://crysiq.ru/uplcv?utm_term=the+oxford+handbook+of+language+and+law PDF link annotation
    • http://epodhajska.eu/UserFiles/File/48387486910.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/12863764184.pdfIn PDF document text
    • http://hydrem.ru/images/file/98648207820.pdfIn PDF document text
    • http://sportservistocik.cz/UserFiles/File/jixawobife.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/15107745854.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/vesasuvuxebegajikanelo.pdfIn PDF document text
    • http://hc6999.com/userfiles/files/72891865951.pdfIn PDF document text
    • http://htwy.com/upload/file/34628441961.pdfIn PDF document text
    • http://ambulatorioveterinariovianello.eu/userfiles/files/19545650614.pdfIn PDF document text
    • https://quatcongnghieput.com/uploads/files/26331754983.pdfIn PDF document text
    • http://www.jasfec.com/imgs/uploads/34812641423.pdfIn PDF document text
    • http://idevicesplus.nl/app/webroot/files/userfiles/files/9339993243.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/fefakigoduponobatom.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/jemiwowumaziwozomewibir.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/vebogiruburuwujuzaga.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/85134622836.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c3cf9e9d15---1233052087.pdfIn PDF document text
    • http://www.asiacoservice.com/file/files/dedakuzujob.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/kajosanitisanu.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/70930936586.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/mulel.pdfIn PDF document text
    • http://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/35089901387.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/bojiga.pdfIn PDF document text
    • http://whatdwellswithin.com/file/kuxajo.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/fobadasovepe.pdfIn PDF document text
    • 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_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F38 18812 bytes
SHA-256: a8c26076634abbee7808ac76fb2bcec0ee533e3c76d1b15793f105270c5593bb
font_02_sfnt_off0001702d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1702D 10760 bytes
SHA-256: a5b204bf3873467ecb668cf144c7e4468f438d2e05105ff5a9e1b83e50d47c4a