Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9009e5dd820b6e1…

MALICIOUS

PDF

83.2 KB Created: 2021-01-27 23:01:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 9f73c6072d3e4ed0d60521f85d289396 SHA-1: 972bf7d4af0de0d439c8c6d70005c0bcb2b37b5a SHA-256: e9009e5dd820b6e169fcb4158ab487f8c27a023cad39b751ff3fd8d4bb1ef9dc
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded links that point to known malicious redirectors and disposable hosting, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lead the user to a malicious site, likely for phishing or to download further malware.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=2015+ia+1040+instructions In PDF document text
    • https://cdn.sqhk.co/bijukipuj/gSADDhj/83240908176.pdfIn PDF document text
    • http://vibuluvizawo.66ghz.com/matomofezugolalaso.pdfIn PDF document text
    • https://cdn.sqhk.co/rujuwawuju/gzhijhD/amazon_kindle_books_lending_library.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/jeih5le/getixoxixejozefanu.pdfIn PDF document text
    • https://cdn.sqhk.co/mawejoxejobe/hbpDx2E/trickshot_map_code_1v1.pdfIn PDF document text
    • http://insurancesouk.com/pujobxmc7n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426270/normal_5fe26cdff420c.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ZHp4jdO/7016274623.pdfIn PDF document text
    • https://cdn.sqhk.co/pelotuwew/RidheaX/happy_wheels_mod_apk_unlimited_money.pdfIn PDF document text
    • https://cdn.sqhk.co/sejarepezibo/jhidAjb/fandango_regal_cinema_16_stockton.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwejozaz.epizy.com/55930105522.pdfIn PDF document text
    • http://wevevaviz.epizy.com/social_media_advertising_proposal.pdfIn PDF document text
    • http://pukevekoba.rf.gd/coolrom_dolphin_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/82477780812.pdfIn PDF document text
    • https://s3.amazonaws.com/titugome/mewanuvajijorikarodo.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_off0000f1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A7 5204 bytes
SHA-256: edbdeb3af7fca789f622987e6f6dbba45408bf2fed54f47e5cd673ae8a533a96
font_01_sfnt_off00010376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10376 11468 bytes
SHA-256: d28bb2d56e8bbe0afad78a8aded5a8228838cfd75fc7e903a10e11341cad08bf
font_02_sfnt_off00012b10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B10 16140 bytes
SHA-256: 1ffca1ef16be5e2ec436e77f9211a88ad3199dc781cb76600401cc2e2c7dce6d

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