Malicious PDF — malware analysis report

Static analysis result for SHA-256 86c628b24918373b…

MALICIOUS

PDF

88.4 KB Created: 2021-03-20 11:13:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 932a496f8501547d09ada2b70f29856e SHA-1: 951e7c438f2efb70088900e80e4a8ef77260f5fc SHA-256: 86c628b24918373b4496993505b9bd1cceb626b77e86168c0abfb43e7ca5f5f1
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The document contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier also strongly indicated maliciousness.

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
  • 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://vilenefex.ru/award?keyword=acupuncture+meridian+points+pdf
    • http://agent-ritual495.online/letter_e_tracing_sheet8tvql.pdf
    • https://cdn-cms.f-static.net/uploads/4428335/normal_604ae15c028ab.pdf
    • http://abanca-electronica.com/global_english_academywaoi1.pdf
    • http://my-credit.info/mapa_mental_de_sistema_general_de_riesgos_laborales_en_colombiaqpd7e.pdf
    • http://lemafesopeposuz.mywebcommunity.org/is_wordpress_bad_for_seo.pdf
    • http://gidpopiteru.com/broken_heart_shayarif5dyu.pdf
    • http://naturaitalia.space/nikon_d5100_lens_for_sports2wvn8.pdf
    • http://doordash.link/galaxy_tie_dye_patterns_step_by_stepvh3bg.pdf
    • https://cdn.sqhk.co/xugosovemi/gchjiep/95042273369.pdf
    • https://cdn-cms.f-static.net/uploads/4405930/normal_604cec914b56b.pdf
    • http://cardio-active.site/what_is_the_best_self_emptying_robot_vacuumizjwl.pdf
    • http://bitsracing.net/what_is_meant_by_conflict_managementprn96.pdf
    • http://geosen.net/137949189494og5s.pdf
    • http://kovatafob.mypressonline.com/how_to_develop_study_skills.pdf
    • https://cdn.sqhk.co/mejeteboxav/ifjcijR/cyberpunk_cityscape_1920x1080.pdf
    • http://pestore.pro/satovibovutipe8xk.pdf
    • http://newyearshop.site/26487228852slhlg.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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_off00011fc1.bin
382f3ea849274a6a6a948e2ca1bffc752afa28ac368c57b70e6ba616a5dd3f70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC1 5260 bytes
font_01_sfnt_off00013188.bin
e53d81776eefdbbe4bf24f24ef3b842644445e8b38c248c4b9843ab4cb5edfda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13188 10392 bytes

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