Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3ee37c343c12ef…

MALICIOUS

PDF

82.5 KB Created: 2021-04-29 10:55:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09476ca14da84632eb79d3384aa1abfd SHA-1: ec6aa9564b1947e64dd3ab663aadacd68a882c50 SHA-256: ea3ee37c343c12efec80a9fc1ccbffe5f2755f547b97c25ded6d539e1d3e2034
156 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. 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 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/strik?utm_term=essentials+of+economics+krugman PDF link annotation
    • http://digitaltoolsfor.xyz/bloodlines_2_richelle_meadcwg8s.pdfIn PDF document text
    • http://cafe-cok.ru/godbound_rpg_bookx17fc.pdfIn PDF document text
    • http://starkrobotics.org/maven_javafx_tutorialfiy4s.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bolovopizonuki/67273751730.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/morphological_identification_of_fungi.pdfIn PDF document text
    • https://cb6d8354-940b-4e05-9f1d-0150973ab277.filesusr.com/ugd/882da0_beebf2af450f4a5da69062578e0f12f9.pdf?index=trueIn PDF document text
    • https://6e229dea-1f83-4be8-8cd3-388eabd4f5e3.filesusr.com/ugd/1cfe37_e68e00f5f7114a4b9fca4681e5d2bf1e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/konark_fibre_cement_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/fukezavazuj/php_for_the_web_fifth_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/bawalidamovidud/ipcc_report_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/15146883840.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/55795539899.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/duvezuze.pdfIn PDF document text
    • https://264cdfe8-48fc-440e-bff3-938583425051.filesusr.com/ugd/cd20dc_00208b5e275d4e0683c4235b1f09ef33.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zamuriza/88010155476.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_41d1e47adade4154b3b7e27cabef90fc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zupenafud/install_apk_from_adb_mac.pdfIn PDF document text
    • https://e5058785-d3d1-442e-b0ad-d0045053dde7.filesusr.com/ugd/17c622_98d99384fb33430dbec4a259caa82d8c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dikomavomem/36439677505.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://scripts.sil.org/OFLIn 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_off0000ece1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECE1 5220 bytes
SHA-256: a7e439b5bdca750f546f454fdf90c0cb29d041cbe53c2edb4270bb5d960aaa62
font_01_sfnt_off0000fe93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE93 12228 bytes
SHA-256: ec8c664d3af50901131d1db46afaaefda1e927a3d782d0a2f787f0d8ff20b0c2
font_02_sfnt_off000127d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127D2 16112 bytes
SHA-256: 04c641d0aedeaa8c494855f42a2e9ae6fad9e3679126e7dc5c08fccc4b41c292

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