Malicious PDF — malware analysis report

Static analysis result for SHA-256 858022ebefc06fb9…

MALICIOUS

PDF

80.8 KB Created: 2021-09-11 08:45:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 1eb7e29c6d838132c30c1bac0e3d7e64 SHA-1: 8de2b31b67631feb97695bb07ec18aac087a2095 SHA-256: 858022ebefc06fb989c85bb875aa551d19f80ef9b7067bb1e5bdd09f9c5b78a4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://rafaelstore.ru/upload/files/93328169135.pdf In PDF document text
    • https://pagodatalk.com/_UploadFile/Images/file/nobexitol.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/92540597136.pdfIn PDF document text
    • http://showdoimovel.com/files/files/93988309403.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/gigalibid.pdfIn PDF document text
    • http://mweb.cz/images/file/vemogu.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090714332473499.pdfIn PDF document text
    • http://halongwave.com/userfiles/file/52366971385.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/67887644153.pdfIn PDF document text
    • https://irantruck.ir/data/file/28324449023.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/tosekorobidabamufusonab.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/4163487953.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/dirolus.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/sobuvilojuxarigove.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/81293779104.pdfIn PDF document text
    • http://gapp.fr/medias/files/motozijimowakimutabopuka.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdfIn PDF document text
    • https://cargobull.cz/res/file/93779471660.pdfIn PDF document text
    • http://lollanaclinic.com/image/upload/File/fapex.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/99660453769.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/68840447239.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613005c7e3fef---kesikowisatewed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=manhunt+2+psp+highly+compressedPDF 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_off0000ce65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE677 20156 bytes
SHA-256: a4f9a78d6412e85038a0ad387545de066657161f430475f53c8a2a681efc704b
font_02_sfnt_off00011b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2B 11288 bytes
SHA-256: c3ca8925a2c0b208149f9d41e51048ccf926c2c6ff585d62c2937a342b82418e

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