Malicious PDF — malware analysis report

Static analysis result for SHA-256 805404f85d1d7c52…

MALICIOUS

PDF

77.8 KB Created: 2021-04-04 08:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8402476426c407bc56b8a6d8edbb237a SHA-1: a859dd1b8fdfa04ade6f668130391b93664628c0 SHA-256: 805404f85d1d7c523ef348b2b3486eb29270971bd98efb7a454c80af0f6f3a8c
126 Risk Score

Malware Insights

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

The PDF contains an embedded URL that redirects to a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. No scripts were extracted, but the presence of numerous external links and the ML detection point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://soxebez.ru/123?utm_term=gba+emulator++for+jio+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382618/normal_602d285b0ad02.pdfIn PDF document text
    • http://kigumelez.medianewsonline.com/kumon_workbooks_free_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426686/normal_604edc07e59c8.pdfIn PDF document text
    • http://stc-l.ru/bootyful_beginnings5wvdl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458407/normal_606139538b649.pdfIn PDF document text
    • http://pelabinowoguk.getenjoyment.net/cuales_son_los_valores_humanos.pdfIn PDF document text
    • http://goodnaturak.space/23841237835b51x4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367914/normal_5fcff3a5043a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389095/normal_6038fc24a5fad.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/lenguaje_corporal_femenino_atraccion.pdfIn PDF document text
    • http://tosasex.22web.org/16339976017.pdfIn PDF document text
    • http://mudixefibewab.mywebcommunity.org/pancreatitis_diet.pdfIn PDF document text
    • http://nuzarekuzugav.mypressonline.com/seweloxufegiri.pdfIn PDF document text
    • http://groby-ritual.online/descargar_winrar_portable_windows_10v61hg.pdfIn PDF document text
    • http://peskomment.ru/kaisi_yeh_yaariaan_episode_170uz1eb.pdfIn PDF document text
    • http://bratskpravojur.ru/p90x_workout_videos_online_free7xvol.pdfIn PDF document text
    • http://snail-case.store/bcbs_member_appeal_form310g0.pdfIn PDF document text
    • http://kellys.space/how_to_teach_english_to_adhd_studentsus04y.pdfIn PDF document text
    • http://alkim.xyz/sql_cookbook_githubjfbeh.pdfIn PDF document text
    • http://dwatches.site/fugofuririlimokavowal136t.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
    • http://mulizin.epizy.com/gadiluwepafog.pdfIn PDF document text
    • https://a1d1c4ac-cf1d-4c58-861c-45d1188f4b60.filesusr.com/ugd/052f3a_68491ab8478f46758eec188b0cdc05a1.pdf?index=trueIn PDF document text
    • http://judegedemo.rf.gd/beware_of_the_dog_roald_dahl.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_b20a29966f7944fc851c872b1b078f47.pdf?index=trueIn PDF document text
    • http://kesewoge.rf.gd/should_i_macos_catalina_beta.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_8e07ef27ae974493912fdffd56e20dd2.pdf?index=trueIn PDF document text
    • http://palalujopaxuv.epizy.com/award_winning_powerpoint_presentation_templates.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 5092 bytes
SHA-256: b32a731aa81242a7aa51f435f79e2d82c3c85ba11adfc7fa87f2f7ef52d275b6
font_01_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 10384 bytes
SHA-256: 6ac490aad92e71f555f4e70590398688a055f5230d36ab271ee2d5afe278cc44
font_02_sfnt_off00011b7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B7D 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f