Malicious PDF — malware analysis report

Static analysis result for SHA-256 f15453fcef5ff94e…

MALICIOUS

PDF

78.4 KB Created: 2021-02-26 11:53:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 5c4a8a2c12e7b27fa5c4de12b6121928 SHA-1: 33b38b2e9115e53039764c6b051d1b604cb91354 SHA-256: f15453fcef5ff94ee5d627fabe469c133b04a0b8cdd0fe1868a83eb14a58ad9f
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting a phishing or malware distribution attempt. The ML classifier strongly indicated maliciousness, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to malicious sites.

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://gimoguvi.ru/strik?utm_term=brown+vs.+board+of+education+1954+primary+sources PDF link annotation
    • http://pilagapub.iblogger.org/falis.pdfIn PDF document text
    • http://submonster.xyz/80183392667anetc.pdfIn PDF document text
    • https://cdn.sqhk.co/wugotiparo/jajdtn4/troll_face_quest_tv_shows_level_30.pdfIn PDF document text
    • http://weramixizagob.22web.org/arcade_emulator_games_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_6014f16a037e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486353/normal_5fe1bd885e658.pdfIn PDF document text
    • https://cdn.sqhk.co/lisutovudaf/iifhaje/unredeemed_movies_anywhere_codes_free.pdfIn PDF document text
    • http://fezibinuzot.iblogger.org/59975566924.pdfIn PDF document text
    • https://cdn.sqhk.co/fedovipawe/pha3Hyd/splash_screen_timer_android.pdfIn PDF document text
    • http://xifotole.iblogger.org/lisizup.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://fepoxojosatomu.epizy.com/apple_pages_table_of_contents_template.pdfIn PDF document text
    • http://vigejufad.rf.gd/roland_xp_80_no_sound.pdfIn PDF document text
    • http://varaxekewuveza.epizy.com/wakaguwutarotonokomo.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/cmc_joint_arthritis_deformity.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/95189984530.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_off0000e670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE670 6048 bytes
SHA-256: c870215da617957b50dd7878b7c1b6d066ae4ea5f68fe998ed863c194456e09e
font_01_sfnt_off0000fb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB15 10244 bytes
SHA-256: 9144b9a49faa41c669c40ee712556348fd2ca2010c5dcb1a57de1ec81fbdda06
font_02_sfnt_off00011e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E2F 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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