Malicious PDF — malware analysis report

Static analysis result for SHA-256 539bbaa5ced84c03…

MALICIOUS

PDF

75.9 KB Created: 2021-04-25 11:31:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8c395ddca00cf281926b1929b2024994 SHA-1: 55f9d33d04e40384960369baef41f06df875a443 SHA-256: 539bbaa5ced84c036ad9109f43a3b17a6ccf089d0448a87db9474963aadd8b4a
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://bologen.ru/strik?utm_term=deadpool+comic+book+1 PDF link annotation
    • http://copyrightsupporthelpcenter.com/fenovopusitibunidafeq72km.pdfIn PDF document text
    • http://jijukilodo.iblogger.org/convert_to_word_adobe_pro_11.pdfIn PDF document text
    • https://cdn.sqhk.co/faruretekiv/SRAwG49/tefizir.pdfIn PDF document text
    • https://cdn.sqhk.co/mibupufek/iOhfzhc/gunekevet.pdfIn PDF document text
    • https://cdn.sqhk.co/furigelo/Hhdjjjh/70s_80s_90s_songs_download.pdfIn PDF document text
    • http://hot-money.fun/automobile_dealership_business_plankz150.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/marcelo_bielsa_book_englishtcfxg.pdfIn PDF document text
    • https://cdn.sqhk.co/nemoludajedu/hfZkjbb/video_downloader_app_for_android_free_download.pdfIn PDF document text
    • http://phtech.site/battle_simulator_2d2nwr1.pdfIn PDF document text
    • http://azakalaza5.xyz/free_online_english_grammar_courseb05td.pdfIn PDF document text
    • http://topplafond.xyz/spirit_of_python_signs56owp.pdfIn PDF document text
    • https://cdn.sqhk.co/fogibadeku/bjfSjcs/knights_inn_mesa_az_phone_number.pdfIn PDF document text
    • http://lg-copyrightforms.com/92962966631fadkn.pdfIn PDF document text
    • http://jewofuvivonog.getenjoyment.net/medical_lab_tests_list.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zexukojol.rf.gd/xefila.pdfIn PDF document text
    • https://74269c25-1731-4359-90d4-804f54ef9c1c.filesusr.com/ugd/b5973a_a83d350d122148128e6a393a74e5b650.pdf?index=trueIn PDF document text
    • http://vimixof.onlinewebshop.net/73351933823.pdfIn PDF document text
    • http://nujowizuwumug.rf.gd/29605586886.pdfIn PDF document text
    • http://tumofif.rf.gd/29222999401.pdfIn PDF document text
    • https://234a0c07-d908-4261-bb83-16b3c96a9b04.filesusr.com/ugd/73e0e6_f2978ec1bb134e398954ec759b5a5a71.pdf?index=trueIn PDF document text
    • http://taximupije.epizy.com/tennessee_waltz_sheet_music.pdfIn PDF document text
    • http://soxarigur.myartsonline.com/political_behaviour_definition.pdfIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 5200 bytes
SHA-256: 14c9498b4354198f327ccf53a1e8972ca09e6aea1a3c9a012d295a5c1625e211
font_01_sfnt_off0000fbbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBBC 11488 bytes
SHA-256: 645beffcfd9cc87a2ac32b3f3c25477ceb6d45ecd2d39827eb8ee6ecb7112502

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