Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fcffa04b0fecc2c…

MALICIOUS

PDF

76.8 KB Created: 2021-04-20 19:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a5694650df97a2beefa8ff315c6f53 SHA-1: acc673a2055b14499c9168a6f14095d6d12dd148 SHA-256: 7fcffa04b0fecc2cc52a40ef0caf7077d921f0bffd4dd122d549c322d729a31e
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically phishing or trojan distribution. The document body, though heavily obfuscated, appears to be a lure related to searching for death records, directing users to external sites.

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://dafemum.ru/strik?utm_term=how+do+i+find+death+records+in+ohio
    • http://vizionsmc.net/fallout_4_visual_overhaul_2020kuz5d.pdf
    • http://vexasefagi.scienceontheweb.net/bohemian_rhapsody_partitura_piano_original.pdf
    • http://ufenmac.com/xidaxukoturufulaxufesipvans8.pdf
    • http://nupesupo.mypressonline.com/aashiqui_2_songs_chords.pdf
    • http://about-central.com/75313527200lulb7.pdf
    • http://sfr-webmail.com/lademegarubaf27a3u.pdf
    • http://healsmall.space/autodesk_dwf_viewer_for_mac7k1jl.pdf
    • http://tovelksa.website/nasa_news_about_sun_lockdownu8465.pdf
    • http://pe50off.info/account_sheet_in_exceluq31r.pdf
    • http://swiss-family.space/9257723252laamu.pdf
    • http://relax35.ru/wezebevawogebabukupemefvzb5.pdf
    • http://jidokove.scienceontheweb.net/dresden_files_storm_front.pdf
    • http://viziziziv.mywebcommunity.org/94363144334.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/072becb2-09e1-4a55-903d-9e76ee6cb7fd/vidopubetiwator.pdf
    • https://s3.amazonaws.com/xukonakefules/new_holland_tc30_pto_clutch_adjustment.pdf
    • https://s3.amazonaws.com/nelizenejakarug/venefakaladugivepux.pdf
    • https://s3.amazonaws.com/napisakaluja/twinkle_khanna_books_free.pdf
    • https://uploads.strikinglycdn.com/files/3cb8d3d0-1a67-443c-8f6e-e3874477a7ad/baxenatomupugup.pdf
    • http://wopojofa.atwebpages.com/historia_de_la_contabilidad_en_mexico.pdf
    • https://s3.amazonaws.com/savukojubusum/book_of_the_damned_supernatural.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_off0000eaab.bin
2eb8429f5d89955ac12ebfe1aff971355169c399fd459ad9d69e44b23ad1df3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAB 5132 bytes
font_01_sfnt_off0000fc2d.bin
28223d11cf6b2cfcc5919eb63e135cbcdb75c0e74cc03e81bfc42632a5463aac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 11860 bytes

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