Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f0693d15868506c…

MALICIOUS

PDF

68.7 KB Created: 2021-02-23 19:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: d099c959940fd5b875e83e06147a9e1a SHA-1: 254993185911d7afd4ff3eb3822872e4b77043d0 SHA-256: 5f0693d15868506c8227715211193a8f7c57a98a1b17767b73df412a23e47f6e
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of external URIs points towards an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/strik?utm_term=mechanical+engineering+diploma+salary+in+south+africa PDF link annotation
    • http://good-production16.site/descargar_mario_kart_64_gratisbeuvi.pdfIn PDF document text
    • https://cdn.sqhk.co/xumirikebixo/qhigeja/transformers_robots_in_disguise_season_4_episode_22.pdfIn PDF document text
    • http://worldthailand.fun/chuck_tv_series_free_mp47eicv.pdfIn PDF document text
    • https://cdn.sqhk.co/letijefa/ihjgijh/did_you_know_facts_health_and_fitness.pdfIn PDF document text
    • http://rineset.xyz/eq2_legacy_of_power_secretsxord2.pdfIn PDF document text
    • http://meetchat.space/mitrokhin_archive_indiaexsoj.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/vOzJhel/ringtone_pro_new_ringtone_2020_tik_tok.pdfIn PDF document text
    • http://rinetezomado.22web.org/what_is_meant_by_law_of_diminishing_returns.pdfIn PDF document text
    • http://adminhalil.com/4220624602mtjeu.pdfIn PDF document text
    • http://vsspb.ru/84648754220890d2.pdfIn PDF document text
    • http://okclub.org/dieta_pobre_em_purinas_.pdfs24zx.pdfIn PDF document text
    • http://hookup157.site/148370825965j56b.pdfIn PDF document text
    • http://naverako.iblogger.org/auld_lang_syne_lyrics_translation_in_english.pdfIn PDF document text
    • http://tacfitproducts.com/because_i_could_not_stop_for_death_analysis_line_by_lineg75ug.pdfIn PDF document text
    • http://hookup671.site/jonuregiwunosesorisedzame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jipudovisubu.rf.gd/10947086211.pdfIn PDF document text
    • http://rajuleneto.epizy.com/guresijifemawumumibagutag.pdfIn PDF document text
    • http://tereralubo.epizy.com/62561915503.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_off0000cdf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF1 5676 bytes
SHA-256: 12e15af8905eb826e6cce27be30306513cbf0f1fe4c8478a331307bc4a5ef168
font_01_sfnt_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 10672 bytes
SHA-256: f55a9539315fcaea6ec976809f30466dc217c709f0b20681923bd85abe6e804e

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