Malicious PDF — malware analysis report

Static analysis result for SHA-256 7431a72d61d74d95…

MALICIOUS

PDF

68.7 KB Created: 2021-09-23 05:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b64259c2079aa221852937b2c5d5a690 SHA-1: 18e9632ed8dc3c89ec9bfe3e6fee71781cbe1b44 SHA-256: 7431a72d61d74d95fadaf84c84a8b2eb67d75ace40669b8819f301561f5ae605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to redirect users. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a tactic to obscure the true destination or purpose of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://thuduchouse.vn/pics/file/zetivexefeboxozabitunagot.pdf In PDF document text
    • http://woodbridgeabw.com/uploads/files/gozapadagot.pdfIn PDF document text
    • http://ranchobg.com/img/file/39038647001.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/15923378889.pdfIn PDF document text
    • http://zawodydrwali.pl/app/webroot/userfiles/file/92734535499.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/nodikemagudaduzive.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad93fba3aa---gowapotexutirojafa.pdfIn PDF document text
    • https://100tmt.com/uploadimage/files/20210911165501.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/dosefabubasepimazakit.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/19272045678.pdfIn PDF document text
    • https://kimcert.net/E/file/20308882784.pdfIn PDF document text
    • https://grouptm2.com/contents/files/wetulebikutigini.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/rasefusefet.pdfIn PDF document text
    • https://extremedriveline.com/ckfinder/userfiles/files/kurovevujodokegakotal.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210914143521.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613df43f145a0---nutedifevagil.pdfIn PDF document text
    • http://slabowidzacy.smprzemysl.pl/ckfinder/userfiles/files/75261502413.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/54977602756.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/favututosujesifati.pdfIn PDF document text
    • https://helicopterleasingservices.com/userfiles/files/jexewakoke.pdfIn PDF document text
    • https://12shio4.com/contents/files/wubopuvoxe.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109010531066965.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/56751431824.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+itube+downloadPDF link annotation
    • https://mediaget.com/userfiles/files/nepoke.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_off0000b235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB235 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA47 14388 bytes
SHA-256: ef76e8224ab96fec4223e048d46be722bf6de4ef4c99b0df3721ca95e3c01bbd
font_02_sfnt_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 10380 bytes
SHA-256: 0f9f53b28793bf334d0f6399301ee652379b980c0cdede07079ffeb6919433c5

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