Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a226f393b73392e…

MALICIOUS

PDF

82.9 KB Created: 2021-02-26 18:35:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c3716bd7577ab333bd5d472bf87e01f5 SHA-1: e08c04fa99dd391558c2382f0e32e4d17390c50c SHA-256: 1a226f393b73392ef05a8d1d8f327c0f6401a97d03c904c5b6b8e7e3d902d103
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded links, many of which point to disposable domains and are likely intended to redirect users to malicious content. The ML classifier strongly indicated maliciousness, and the PDF structure suggests a link farm designed to obscure the ultimate destination of the embedded URIs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jacksth.ru/strik?utm_term=what+is+the+appropriate+alignment+of+a+mla+style+paper PDF link annotation
    • http://soldatskaya6.ru/hendaye_surf_report_magicseaweedo7vj9.pdfIn PDF document text
    • http://zatoboyvibor.fun/armored_warfare_tank_guide23gv2.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/gina_asma_pediatria_2017.pdfIn PDF document text
    • http://ductsunlimitedins.com/water_tanks_for_sale_near_mel2k11.pdfIn PDF document text
    • http://fionainthefield.org/21903041185emv1z.pdfIn PDF document text
    • http://erogan-oficial.site/before_i_fall_freefilmw3xjb.pdfIn PDF document text
    • http://dwatches.site/wizards_unite_magizoologist_skill_tree_guidee29or.pdfIn PDF document text
    • http://vykupavto54.ru/pigudugetoligil8ilr1.pdfIn PDF document text
    • http://rrrrkkkkk.space/detekaviv2h4iz.pdfIn PDF document text
    • https://cdn.sqhk.co/fofateze/jhhfXz5/best_bingo_number_generator_app.pdfIn PDF document text
    • http://quickstore.pro/how_much_is_a_49cc_scooter4e2hp.pdfIn PDF document text
    • https://cdn.sqhk.co/xuluriwu/sU4asjf/baforosumikibinami.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/dgBUjfV/space_force_season_2_release.pdfIn PDF document text
    • https://cdn.sqhk.co/bamosabubesi/84oih9X/16496624251.pdfIn PDF document text
    • http://nukuxarigikuxez.iblogger.org/how_much_does_a_media_communications_major_make.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nejegidijikoj.epizy.com/patriots_edelman_injury_report.pdfIn PDF document text
    • http://sazuronami.epizy.com/hp_officejet_pro_8500_wireless_driver_download_windows_7.pdfIn PDF document text
    • http://zuxulabawiba.rf.gd/joxalavipep.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010692.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10692 5432 bytes
SHA-256: 5a5ac787457dbf48dcfa69696a1bf81a72eb366163690163bcd5681267eefd92
font_01_sfnt_off000118fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118FA 10984 bytes
SHA-256: d0e1bce5acf3f1a3be09e48b4b001a51572e388c1796d974585f488236b14285

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