Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a8ba0514df8a06d…

MALICIOUS

PDF

79.3 KB Created: 2021-04-07 06:29:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a7b69ded24251c7829874af0b32b0614 SHA-1: 5345d44b5203bec3dc41c0419cb7343bb829c05b SHA-256: 4a8ba0514df8a06d48fc203c42cd6d6f8a31bc7c57adfa3e6e3e4591e6f394de
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which are disposable and used in link farms, suggesting a phishing or redirection scheme. The document body, though partially corrupted, mentions 'Basic flowchart exercises with answers', likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/123?utm_term=basic+flowchart+exercises+with+answers PDF link annotation
    • http://voztrans.ru/preparation_of_hexaamminecobalt_iii_chloride_experiment_reportw69dd.pdfIn PDF document text
    • http://max-lifting.store/nibaxegea40rt.pdfIn PDF document text
    • http://musc-media.xyz/27140200244lnaea.pdfIn PDF document text
    • http://pugezesiw.mygamesonline.org/acidosis_metabolica_en_neonatos.pdfIn PDF document text
    • http://itclick.pro/23412998785nvelu.pdfIn PDF document text
    • http://ompala.store/the_nightingale_movie_dakota_fanning_trailerxcjbk.pdfIn PDF document text
    • http://amst-watch-v2.club/overview_classification_of_matter_answerskxu68.pdfIn PDF document text
    • http://idealicaitalia-ufficiale.site/john_deere_567_baler_monitor_for_sale2d18a.pdfIn PDF document text
    • http://apparentlyopt.com/child_labor_in_textile_millsp3rj3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369651/normal_6016d710284c7.pdfIn PDF document text
    • http://nutristrike-shop.ru/physics_formulas_for_kinematics_in_one_dimensionvs0y4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_6040e7ef3fa8a.pdfIn PDF document text
    • http://nopazurexubiwis.22web.org/certificato_anamnestico_porto_d_armi_modulo_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391319/normal_6007011ae44e9.pdfIn PDF document text
    • http://zhk-samolet-krasnodar.info/bekozovegigo9zfm0.pdfIn PDF document text
    • http://gitikirazidapi.medianewsonline.com/napapugadud.pdfIn PDF document text
    • http://fotowotesepe.22web.org/where_is_the_reset_button_on_adt_panel.pdfIn PDF document text
    • http://vivubowi.getenjoyment.net/tutorial_camtasia_studio.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_ebdac12cf9894b30a888cbd310d8deb4.pdf?index=trueIn PDF document text
    • http://zejusamipokera.myartsonline.com/solving_equations_algebra_1_worksheet.pdfIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_d3662bac1f7f47658748709b1d133de4.pdf?index=trueIn PDF document text
    • https://72dfff08-f6cb-4f5d-aaac-ebe71175d6a6.filesusr.com/ugd/c268f7_cf4663fc3fe54f1eb84ac0b1c7c17bfc.pdf?index=trueIn PDF document text
    • http://desujiruvomeb.myartsonline.com/top_100_adjectives_in_english.pdfIn PDF document text
    • http://pivasif.rf.gd/foreign_direct_investment_in_brazil_report_2018.pdfIn PDF document text
    • https://d4cba69e-f3c5-4a64-9e40-69ba24924691.filesusr.com/ugd/b73feb_9e0763227d914db8a9cbc494249c1bec.pdf?index=trueIn 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_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 4964 bytes
SHA-256: 7d77fbf42809f72cf5d871d0c2f42dcedf7d25972c854c7129da24292909a3b6
font_01_sfnt_off0000fc68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC68 10836 bytes
SHA-256: 59f8e8ceb8a0f670c9ffa8166385ce5c7c97a63d50f62c92345d1d67cd31aba8
font_02_sfnt_off0001215d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3