Malicious PDF — malware analysis report

Static analysis result for SHA-256 4941a92275c03e3d…

MALICIOUS

PDF

77.3 KB Created: 2021-01-19 10:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 943087c1486bb5f3f0529e186281474e SHA-1: ebc41332664b340bb0ed8fbb44c68d0891568115 SHA-256: 4941a92275c03e3d1ea1ae3b9989cb6a7bc56fb7601bc6fffa95cb8aa8cfbd5b
204 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, appears to contain metadata related to court records, suggesting a lure to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious redirectors points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://ggtraff.ru/123?utm_term=lenawee+county+court+records In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370791/normal_5f8989263165d.pdfIn PDF document text
    • https://site-1256481.mozfiles.com/files/1256481/stir_casting_process_nptel.pdfIn PDF document text
    • http://gasomenuza.iblogger.org/fortnightly_timesheet_template_excel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500447/normal_5fff6c0e6713a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424991/normal_5f9fbd8eeb64a.pdfIn PDF document text
    • http://nelawetazabuta.66ghz.com/three_hands_of_fate_pad_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424376/normal_5fb97e904ab67.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://bamasagure.epizy.com/53955364131.pdfIn PDF document text
    • http://mikipifovusi.epizy.com/bams_1st_year_syllabus_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/nefagolom/juniper_elementary_school_fontana.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/93426610024.pdfIn PDF document text
    • http://rolodumom.epizy.com/uncle_ato_mensuro_song.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/batiwafakenuvuz.pdfIn PDF document text
    • http://dixolasafu.epizy.com/zewiwudumegovozaxilorozi.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/guwulujesifez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d93a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93A 5036 bytes
SHA-256: 721a6a88315ad29a2be162471e79064ba03f7244c0f557ac856b7a82a8ed015d
font_01_sfnt_off0000ea85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA85 10580 bytes
SHA-256: 4d961c0f3cd0cc9868890923d4f76e0ef0c3a6d24922473c5e3825a042f15315
font_02_sfnt_off00010ef2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF2 7292 bytes
SHA-256: 7ffdb251fdcd3e9d9c7afd1b1a66dffaf0f22d33f805d7f5b03882aa3044d3a5

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