Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7d3dd3e5d78d1d…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 01:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 58d26a0541b4ac26995c198d61bbb6e2 SHA-1: 122051a4c6dfa98272089de999531bf271a49610 SHA-256: 6d7d3dd3e5d78d1d43608d78417fb954f7137cb4fb7c3b257701e8866185cdd0
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits PDF vulnerabilities for execution. The document body is heavily obfuscated, but the presence of numerous embedded URLs, many pointing to disposable domains and employing link farm techniques, suggests a phishing or redirection attempt. The primary goal appears to be directing users to malicious websites, potentially for further malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://bhk-aindling.de/userfiles/files/toxunewigigiliru.pdf In PDF document text
    • https://maurinet.com/userfiles/file/tabenatosidojesewix.pdfIn PDF document text
    • https://mollis.rs/files/73905373826.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/39611845600.pdfIn PDF document text
    • https://lyonsinn.com/nbloom/fckuploads/file/sitapewepamiti.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///33222911807.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/walezibevimowufutonuv.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/jesevunurosu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614afdd8081a7---2678567544.pdfIn PDF document text
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/kamararavomototukaz.pdfIn PDF document text
    • http://mrybalko.ru/files/tapifotowudixafof.pdfIn PDF document text
    • https://btegypt.com/file/51948818552.pdfIn PDF document text
    • http://ticketsperiodico.com/galeria/files/botoganefivivufubipexig.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/14358166442.pdfIn PDF document text
    • http://ihdbd.org/upload/files/4103388334.pdfIn PDF document text
    • https://amgaa.org/temp/files/rikemaket.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/gakiboxofifuf.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/xefidapal.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/27201718306.pdfIn PDF document text
    • https://bnovum.hu/downloads/21557111603.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/81335810662.pdfIn PDF document text
    • http://theffirm.com/userfiles/file/podaro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=pokemon+black+and+white+emulator+pcPDF 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_off0000af3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3D 11032 bytes
SHA-256: c77d4ce66089116433ae940ab494249cd257bc6ef4b76c0af8bebe103e1a6de9
font_01_sfnt_off0000c884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC884 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE096 15272 bytes
SHA-256: c42e8265fff80d7942df9231abd9caf8a121da60d4250e1c63a24c97b766e163

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