Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce97a7bc526aa078…

MALICIOUS

PDF

74.9 KB Created: 2021-02-28 19:44:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c86aad2a8049eefc2142cd9a656a4653 SHA-1: 1c7f26d2a38c9918628a9a54294a4709593bf8a0 SHA-256: ce97a7bc526aa078f4021226c01052bb8b77d0c9f1f7699d03558c3503bf6152
126 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many pointing to disposable domains, indicating a link farm or SEO spamming operation. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and numerous external URIs suggest it's designed to redirect users to potentially malicious content, possibly leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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/strik?utm_term=cover+letter+examples+board+of+directors PDF link annotation
    • https://cdn.sqhk.co/gukokefa/hg7ujjE/ocean_raft_3d_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/gedofovel/jifxjcM/76955941340.pdfIn PDF document text
    • https://cdn.sqhk.co/gesuxafom/ehehhVf/best_video_calling_app_for_android_and_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kefekawit/jjb6ZeA/7772534163.pdfIn PDF document text
    • https://cdn.sqhk.co/lilaxikixo/hjiMbjh/national_train_your_brain_day_images.pdfIn PDF document text
    • https://cdn.sqhk.co/vitimosugu/gjhbgdK/helicopter_kit_for_sale_usa.pdfIn PDF document text
    • https://lodikesilir.weebly.com/uploads/1/3/4/8/134868057/5061714.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/viajfjh/cute_cat_hd_wallpaper_phone.pdfIn PDF document text
    • http://vopibuxipem.22web.org/lopovij.pdfIn PDF document text
    • http://moxolesapudeli.22web.org/32676453339.pdfIn PDF document text
    • https://cdn.sqhk.co/putuziboki/Jhj8JBr/spinner_chaos_battle_mod_apk_download.pdfIn PDF document text
    • https://wubepifumemav.weebly.com/uploads/1/3/4/1/134109226/1960561.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebanibaru.epizy.com/20448968049.pdfIn PDF document text
    • https://s3.amazonaws.com/kesumasaka/37464122394.pdfIn PDF document text
    • http://viromumixemet.rf.gd/xewedanilitasamududebagof.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/read_dc_comics_online_free.pdfIn PDF document text
    • https://s3.amazonaws.com/gixirojozogufux/ibpsguide_monthly_current_affairs_quiz.pdfIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/cara_buat_cv_file.pdfIn PDF document text
    • http://gonuwufif.epizy.com/fairy_tail_anime_episodes_guide.pdfIn PDF document text
    • http://sunemixawuvija.epizy.com/no_answer_traduo_portugus.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/acorn_curved_stairlift_manual.pdfIn PDF document text
    • http://zatofax.rf.gd/how_to_overcome_ocd_behavior.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_off0000e734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE734 5472 bytes
SHA-256: faca8a995a9aaaff6e5a9665fe3e43c2238ff84760f70d0e14be3de57ea7a6bf
font_01_sfnt_off0000f9bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BC 10988 bytes
SHA-256: 33e2408b8a0853e58cb57aa5a6c410ba8da954a99e9b792149dadd50ecce69dc

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