Malicious PDF — malware analysis report

Static analysis result for SHA-256 49295bfe8d0fc462…

MALICIOUS

PDF

76.1 KB Created: 2021-03-17 21:22:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f436e2fcd9b1fb7f624e8907dc22dabe SHA-1: 840b0f1467c6b776a0a106961418f1fd0e4f9abe SHA-256: 49295bfe8d0fc462805d8e665ed5764b393cab8c5c1339e0d9840e3fdf072014
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs disguised as puzzle downloads, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a tactic to distribute malicious content across many domains. While no scripts were explicitly extracted, the presence of external URIs and the overall structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://golowaki.ru/award?keyword=lateral+thinking+puzzles+pdf+download
    • https://static.s123-cdn-static.com/uploads/4390641/normal_5fc95c6d9f088.pdf
    • http://uablog.site/problemas_de_dinamica_resueltosd8v8s.pdf
    • http://sadovik.me/6258152095coi3i.pdf
    • https://cdn-cms.f-static.net/uploads/4369909/normal_601abd27737f8.pdf
    • http://hq-cleartv.info/vba_excel_functionsvovrx.pdf
    • http://shop-profildoors.ru/shaman_cataclysm_guide760um.pdf
    • http://duwudivusupo.mygamesonline.org/furofa.pdf
    • http://safijejog.mygamesonline.org/garmin_405_forerunner.pdf
    • http://kogowetek.getenjoyment.net/how_to_convert_j_mol_k_to_j_g_c.pdf
    • http://vorgazme.com/how_to_find_answers_on_quizlet_faster_on_iphone574z6.pdf
    • https://cdn.sqhk.co/ponajadu/iXhe0aL/mubanelesidu.pdf
    • https://cdn.sqhk.co/kerametunal/1kiiP6P/trickshot_map_code_orba.pdf
    • http://durebemidiges.getenjoyment.net/tekowomofijifazakejoda.pdf
    • http://xitimudajejo.mywebcommunity.org/80358839240.pdf
    • http://melomone.scienceontheweb.net/what_resistance_band_should_i_start_with.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xaramoturowuf.rf.gd/fudapinedogodar.pdf
    • http://bavotuvezomevi.myartsonline.com/how_much_does_a_fitness_instructor_earn_in_canada.pdf
    • http://bifovigavij.myartsonline.com/what_will_the_stars_look_like_tonight.pdf
    • http://wuwovedivaz.rf.gd/lewod.pdf
    • http://lugivodunoxasi.atwebpages.com/pojewubakirifoxotukosiz.pdf
    • http://dakafatuvuguviz.atwebpages.com/renin_aldosterone_angiotensin_system.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_off0000ec72.bin
464abab7e99189f90bac13a666136bb52dce2a8c2dfa0c79472dd4a958de4bb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC72 5452 bytes
font_01_sfnt_off0000ff16.bin
db883e00a550b7e37db2b472cb3e22e97b0f3768f3ba70202f795e57b185f4fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 10872 bytes

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