Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d525c66f3e0ef6f…

MALICIOUS

PDF

75.4 KB Created: 2021-01-22 07:41:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: fe14aef24ae2c3cb0816bd8b4d2b9be1 SHA-1: 24c5a26dab1d417c476bdde51fe675c3a15fe69c SHA-256: 3d525c66f3e0ef6fb9aa0487615cf34f84063130ffe7a60fab5b37db1a58fac6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1190 Exploit Public-Facing Application

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm designed to obscure the ultimate destination. One prominent URL, 'https://trafftec.ru/123?utm_term=wilkes+county+tax+office', appears to be part of a lure related to tax office notifications.

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
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://trafftec.ru/123?utm_term=wilkes+county+tax+office PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482636/normal_5ffaa24e56b60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385410/normal_5fd071582886c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371240/normal_5ff75c97a949e.pdfIn PDF document text
    • https://site-1176264.mozfiles.com/files/1176264/firaguzabimodopuporo.pdfIn PDF document text
    • https://site-1241800.mozfiles.com/files/1241800/32067385163.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/bGjaaji/wekububegesapef.pdfIn PDF document text
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/pumigefufemineva.pdfIn PDF document text
    • https://site-1083549.mozfiles.com/files/1083549/academic_games_equations_worksheets.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/b248cff3a40ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378151/normal_5fd5f5ef9e938.pdfIn PDF document text
    • https://site-1174542.mozfiles.com/files/1174542/missile_command_portal_2.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/vepuv.pdfIn PDF document text
    • https://labifunuvi.weebly.com/uploads/1/3/4/8/134847398/8103798.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/icXTigi/lion_king_ballymena_cinema.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/3gchjha/3568623053.pdfIn PDF document text
    • https://cdn.sqhk.co/rijujonakuje/EEPigtB/66908156067.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://savefativiluz.epizy.com/kopituvuw.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_off0000e6b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B0 5028 bytes
SHA-256: 459cf37373d65da0b9849ff64bb5e39acc2ea583037ca637baf4933b11cfe6b8
font_01_sfnt_off0000f802.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF802 11364 bytes
SHA-256: ae76b4b3cbbbd2f6c9234a1ca89a74f66678a2263b15f6352d1b13f94d92eabe

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