Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e0c359632d4a99f…

MALICIOUS

PDF

92.0 KB Created: 2021-09-12 00:13:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 572fca0dbf8f5e65048a96580732fd87 SHA-1: aac0a4b91a82d3f7e13d12b0d3ba00955fa638c6 SHA-256: 4e0c359632d4a99f65a8de0ab48545cb27ab36ab4be8f552c9e8fd1cb546d1e6
126 Risk Score

Malware Insights

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

The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates this PDF is a link farm, likely intended to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, while many are unknown or benign, contribute to the overall picture of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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 https://newcar-rental.com/uploads/files/202109081936097242.pdf In PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/161362aa79f92e---46997314946.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/givifasifasakepajitiw.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/36882460977.pdfIn PDF document text
    • https://matratva.in/userfiles/file/rowomumuvezirazo.pdfIn PDF document text
    • http://artdealer.vn/upload/fckimagesfile/05896b3ccba77e0fe42967d106a4a5a2.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b5ab376e49ea175fc0dcc7d1d5ef0b2e/31437333986.pdfIn PDF document text
    • https://wsbtitan.com/images/file/6003393919.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/67522769430.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/36526045293.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/16856031718.pdfIn PDF document text
    • http://terredellamagnagrecia.com/userfiles/files/6597150695.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/84433547737.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/42e87c15b6fa106e6a4092719b9b3c29/wujaj.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/wukasas.pdfIn PDF document text
    • https://songhongresort.com/img/files/33912906943.pdfIn PDF document text
    • http://coiffurenais.com/userfiles/file/sirab.pdfIn PDF document text
    • https://artbynela.com/uploads/file/27056251902.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/24715052542.pdfIn PDF document text
    • https://thuhuonglacquer.com/uploads/news_file/29356371094.pdfIn PDF document text
    • http://cjmfgx.morefriendship.com/upload/files/22457564066.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/47344708887.pdfIn PDF document text
    • http://asfalon.com/__files/file/tipuropazowurafamedoz.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/93510992.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/33153917204.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=season+11+episode+1+the+walking+deadPDF 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_off00010129.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10129 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 18564 bytes
SHA-256: 715dd67b66e1e4a049784d00380fbc5629ceb46272f59d7b8dbac263f486f779
font_02_sfnt_off0001493a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1493A 10876 bytes
SHA-256: b0f6800537370ba539c4d06cfe96228289d3621542d3de9d00f59b433bce381a

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