Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea3fe6f055eccf…

MALICIOUS

PDF

111.2 KB Created: 2021-03-16 18:28:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 790dca6db8da7ab74b8f9b674f0c54eb SHA-1: 5d34708018469f40124904f0048966924dbe543d SHA-256: b4ea3fe6f055eccff445e981c173ef41e30bc325797034165ef254628c90b88d
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 0.9982

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://baarspo.ru/wix?keyword=suramar+scenario+guide+pdf PDF link annotation
    • http://4kuhd.me/87882878079nclrc.pdfIn PDF document text
    • http://rezexepenoma.scienceontheweb.net/how_do_you_reset_a_robertshaw_thermostat.pdfIn PDF document text
    • http://rotawafuwuno.scienceontheweb.net/halo_silentium_review.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/juvimo.pdfIn PDF document text
    • http://how2clever.com/galvanized_iron_sheet_unit_weightual1c.pdfIn PDF document text
    • https://rafowatixi.weebly.com/uploads/1/3/0/8/130874563/luvaj_dapajowowegaz_wudofufi.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/VCjcv8t/amazon_fire_stick_mirroring_iphone_6.pdfIn PDF document text
    • http://support-copyrighthelpservice-about.com/2d_finite_element_method_matlab_codeoeveb.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/HjejsSF/tatisudez.pdfIn PDF document text
    • https://rugajasaxi.weebly.com/uploads/1/3/4/0/134096424/6cf68ab06ad4d.pdfIn PDF document text
    • http://veritebadisifif.iblogger.org/nadopijedajajosidipudi.pdfIn PDF document text
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/nakekizamoxixitudunu.pdfIn PDF document text
    • http://termometr-medikal.site/geralds_game_film_explainedwkfyb.pdfIn PDF document text
    • http://znakomstva18x.site/printable_english_worksheets_for_4th_gradeidcq5.pdfIn PDF document text
    • http://jekefidaz.mygamesonline.org/jazupujuviwazowib.pdfIn PDF document text
    • https://cdn.sqhk.co/kufalavoxig/7jiAWij/crossword_puzzle_games_free_download_for_pc.pdfIn PDF document text
    • http://#$%^&*/2BmQ5wqWATCHIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0a497e50-07dd-462d-832d-d8678f741a8e.filesusr.com/ugd/5f857b_2083725bcac54adf82eeaa883efb8949.pdf?index=trueIn PDF document text
    • http://zokivobadid.rf.gd/chaos_altar_osrs_prayer_guide.pdfIn PDF document text
    • https://d6aab468-caab-4d9e-910f-d3bf64ae4104.filesusr.com/ugd/5438e3_ecc54deedffa4a6c93b88e88a7ae5c7a.pdf?index=trueIn PDF document text
    • http://xeroxuzowi.epizy.com/macbeth_full_movie_in_hindi_dubbed.pdfIn PDF document text
    • http://jowawaba.atwebpages.com/will_there_be_an_odd_thomas_movie_sequel.pdfIn PDF document text
    • https://bf130ee1-1463-4c69-9604-1b23772ced92.filesusr.com/ugd/b4609a_67e8b06144064f45a76760230a8986c2.pdf?index=trueIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_4072d21e9d5f429cbb8618b862c70f1c.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EA 6420 bytes
SHA-256: 31650afe280cae27e5589a17089bbda1d376c58eb3394e8526109ccc9a4c205d
font_01_sfnt_off000158b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158B5 5544 bytes
SHA-256: d93565e95a8cfbed7a4750d1fb1c63d75883e686505ec627dbacadb2c99dd1b4
font_02_sfnt_off00016b7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B7C 13112 bytes
SHA-256: 234598ecfcbeffad06b08344b528fe686d3243a1dcb787c715f44a4987a1c4c7
font_03_sfnt_off0001974c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1974C 16680 bytes
SHA-256: 042eedfc0951a8fbffac4e8b96101ad6ec89e63b18270fc9ef8f2881b9cc3b35