Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8b4bace22d43751…

MALICIOUS

PDF

72.6 KB Created: 2021-01-27 15:50:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 475ba3ca1b26fe67bfa4afd698ef2319 SHA-1: 5cdd66162d22c24b9d6343aa60775d0214271a64 SHA-256: d8b4bace22d43751db92cabc511feacd03e11a928b0523b46d6b07d264ac7e7b
184 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a URL associated with malicious redirector infrastructure, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The document body, though heavily obfuscated, contains text related to downloading software, aligning with a phishing or scam lure. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/wb?keyword=como%20descargar%20actc%20racing%20para%20pc In PDF document text
    • https://cdn.sqhk.co/korulifesewa/ndhdgfQ/vijepek.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/agcGWjM/99448059407.pdfIn PDF document text
    • https://dikemogegopur.weebly.com/uploads/1/3/1/4/131406608/rexukivuj-mezadubopux-xenigidip-xerodikesijus.pdfIn PDF document text
    • https://lasebotoxuxuxir.weebly.com/uploads/1/3/4/7/134729765/wurexesezavenuk.pdfIn PDF document text
    • https://letazofuwukuge.weebly.com/uploads/1/3/4/8/134869061/35717.pdfIn PDF document text
    • http://nukowivoxom.iblogger.org/best_app_windows_10.pdfIn PDF document text
    • http://widuzuduzudovix.iblogger.org/lanewar.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ahdicbr/19446571101.pdfIn PDF document text
    • https://fuwowomazusora.weebly.com/uploads/1/3/4/0/134000162/meralexajafixuseku.pdfIn PDF document text
    • http://buvavarosavadar.iblogger.org/28585380355.pdfIn PDF document text
    • http://sdfsdfsdf.shaketorch.com/94787959459.pdfIn PDF document text
    • https://cdn.sqhk.co/diridenafa/2jhjfij/xfinity_prepaid_internet_and_instant_tv.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/nitirew/jipaxoje.pdfIn PDF document text
    • http://jugikan.epizy.com/boy_like_you_kesha_free.pdfIn PDF document text
    • http://wokezafuvix.epizy.com/buhler_industries_2017_annual_report.pdfIn PDF document text
    • http://lezebotetojezaz.epizy.com/online_android_code_editor.pdfIn PDF document text
    • http://joxamemi.epizy.com/plague_inc_mod_apk_latest_version.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC3 5264 bytes
SHA-256: 56514be2e5f3cf7a767be1d3f2d8bc5a7ce50e0d2d87f6c9548181bbb93f3662
font_01_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 11356 bytes
SHA-256: a51f1acc21aef48cabcf4cbc75595765087d9d4dfb0afd588a33c8c4c892e445

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