Malicious PDF — malware analysis report

Static analysis result for SHA-256 b304e46cadd5f009…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 10:59:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cb8bdd93a8dc160c5e59a355662e8964 SHA-1: ec9a6d2b46c523c198d6c321c450413cec74bc23 SHA-256: b304e46cadd5f009ebca3cf63adcaaa03cfb3abdfc17ef9d1dbac4b9142dd79c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, indicating the PDF's purpose is to drive traffic to these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://uleshuzatshop.hu/files/file/51135280315.pdf In PDF document text
    • http://flywings.sk/UserFiles/file/vesideveranenademuwebo.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/84365411394.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132909c4a9e8---wolatu.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210914_EC0D921001405151.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613af43355c03---21521194899.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/75213150879.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/tajasazibine.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210917_32E0FEFB0F648903.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/74678669153.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/50923706347.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/99641032144.pdfIn PDF document text
    • https://goldengatetaichiqigong.com/userfiles/file/wamunoxolokagasu.pdfIn PDF document text
    • http://precisao.org/files/files/59155703689.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090123192573499.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/derajidobipalewul.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/zenomidepajala.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/83281121734.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/41231718447.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/53531110989.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/jenasibovirudakomafij.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/19373294188.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/wuliwilujoxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+free+up+storage+in+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_off0000dd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD58 17392 bytes
SHA-256: 93c5fe12a585105da670316ca42c85e0f7f2f9b69fe64e0e898cf1a223bd19b1
font_01_sfnt_off00010ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 10804 bytes
SHA-256: b70cc2278b0b8ead874c13e773c6c9bb744cff7197ef1f0af42a48576fca7bc6

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