Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd288db457eb8c6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-02 21:03:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 6fca46bf9a3b0b10499996cb2b69db61 SHA-1: bb269bd952fb27f7eb173555a1a6e83584c3ff3e SHA-256: fbd288db457eb8c68da3f3a9ba94032e72fc058aa9ac5f2be09e5ea22fdd99d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.americaninvest.net/upls/files/wafozigopadivilajir.pdf In PDF document text
    • http://mid-europe-ex.com/images/blog//file/68961786279.pdfIn PDF document text
    • https://pasifikendustriyel.com/userfiles/file/82391223747.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/3473775838.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40244363456.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/96001513576.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe03c38b74---94926109538.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/2769585085.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/xorosopamabesep.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/wabarodadulemasokinim.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c90d3629eb3---xaroxolozet.pdfIn PDF document text
    • https://thietkevuphong.com/uploads/image/files/36704487417.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/45861550755.pdfIn PDF document text
    • http://pneusmarene.it/images/file/wolelibodijojux.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/38989109306.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/66211602341.pdfIn PDF document text
    • https://csodamalom.hu/files/files/nidofam.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/16345703561.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/xubibemapofidoko.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/voner.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/mobevomujonaweximu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=avian+pathology+pdfPDF 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_off0000c7f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE010 10540 bytes
SHA-256: 9446664cf9c9f5f74567176981bdca96ec259e7013b89daa36dc902caf5da988
font_02_sfnt_off0000f7cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CC 18164 bytes
SHA-256: 97a1de97287d886abcd7e4d6c72d1745c28f75d2ed7c690915a4929f76878717

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