Malicious PDF — malware analysis report

Static analysis result for SHA-256 55c6a0f994bec53c…

MALICIOUS

PDF

75.0 KB Created: 2021-03-28 20:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348cdf6581fdc0ff1c2b07537c195b5b SHA-1: d281f52790cef0b403fd314e2ed2c16fa6bf22d6 SHA-256: 55c6a0f994bec53c583361fa0da1576b24ad233d2a3b28439b55b6c3031c3da7
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs that redirect to external websites, one of which is identified as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to movie downloads, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://seumenha.ru/strik?utm_term=free+willy+2+the+adventure+home+1995
    • http://rapisakaxo.66ghz.com/xoguguwepoboset.pdf
    • https://cdn.sqhk.co/gadowikuxe/gzG5gcD/45446642835.pdf
    • https://cdn-cms.f-static.net/uploads/4369763/normal_600b4b2620bae.pdf
    • https://static.s123-cdn-static.com/uploads/4449974/normal_5ff201d067708.pdf
    • https://cdn.sqhk.co/naxupowu/jcjibje/star_wars_x_wing_fighter_names.pdf
    • https://cdn.sqhk.co/filomada/mYhaUgg/73115638151.pdf
    • https://cdn.sqhk.co/zumedizojas/jgjfjfY/84609399900.pdf
    • https://static.s123-cdn-static.com/uploads/4420612/normal_5ffff0f3f141c.pdf
    • http://fenijazefak.22web.org/boscov_s_application.pdf
    • https://static.s123-cdn-static.com/uploads/4453741/normal_5feb40df9b2ba.pdf
    • https://cdn.sqhk.co/binuwaxe/byRjggf/mera_bhola_hai_bhandari_ringtone_wapking._com.pdf
    • https://cdn-cms.f-static.net/uploads/4379848/normal_604ccb2c48cb8.pdf
    • https://cdn.sqhk.co/gukugifixija/fG5pjde/ielts_general_listening_test_with_answers_2019.pdf
    • http://tonalemeketav.66ghz.com/ms_publisher_flyer_templates_free.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://52c77544-2eb8-427c-ad0e-a8a7e2ea9366.filesusr.com/ugd/93288f_1535e4352cd8494e9f951eed3ac0f516.pdf?index=true
    • http://tovedutineve.rf.gd/83110227599.pdf
    • http://pipovafalalum.rf.gd/7038477644.pdf
    • https://6f0a1f77-3195-4c90-aae7-8e5805bb56bd.filesusr.com/ugd/f94fd0_dd7762d41c0b4534863d7e688384e687.pdf?index=true
    • https://d128792e-e0a8-46e0-98ed-b941f5da69b2.filesusr.com/ugd/b98abb_87ecfd89aa70467a878801804cce514e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/0a20b8c9-5f59-43b4-b395-8728d6fea034/fadebimisujalodole.pdf
    • https://uploads.strikinglycdn.com/files/d127cef3-b4cc-4821-b2cd-64a9b1911513/rovok.pdf
    • https://uploads.strikinglycdn.com/files/82e2fc75-29b8-426f-b6b0-84cd310f3420/acurite_outdoor_thermometer_with_humidity.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e636.bin
a8cb8772526e3758ca364299bb815735ced5e6cb868396e69ae9e7291abfb8b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE636 5560 bytes
font_01_sfnt_off0000f914.bin
fda3458a34d303f5cd9d7cc03b4d7e2ba7b31a50c9bcfb840ef5e11f12ff5ebd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF914 11316 bytes

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