Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c44470ad281ff95…

MALICIOUS

PDF

77.6 KB Created: 2021-04-01 22:11:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3fe1341012b6cfdc8b41e0a8591231f SHA-1: 4e371bf01ca0badfa91b47600f64187a29778cee SHA-256: 6c44470ad281ff955284ab2ae92b1b37512eabdf884405fb76ade0bd8dd90273
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many of which are disguised as legitimate documents. The primary malicious URL identified is 'https://jumiwimov.ru/123?utm_term=tan+card+application+form+pdf+2018', suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=tan+card+application+form+pdf+2018
    • http://pepujolajerikur.66ghz.com/kpmg_logo_guidelines.pdf
    • http://copyrightsupport-ig.com/rolajuhit6q.pdf
    • http://help-copyrightservice.xyz/55132354895ay5lt.pdf
    • http://sweetmeet.online/sticker_joker_whatsapp_20192vm65.pdf
    • http://wuroguredogir.getenjoyment.net/sipozogewev.pdf
    • http://pearhaidhr.fun/74607692415pv9mg.pdf
    • http://bizifemodefi.mygamesonline.org/health_optimizing_physical_education_book.pdf
    • http://niwopofe.scienceontheweb.net/28840507344.pdf
    • http://zoneeuro.pro/first_alert_7010bsl_beepingwau3s.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mejados/begesifonewudenib.pdf
    • http://likewiwojuxus.atwebpages.com/pictionary_words_printable.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_aa547de1cc954cf49ad2cad2b1a949f2.pdf?index=true
    • https://s3.amazonaws.com/senodiw/what_are_the_consequences_of_climate_change_wikipedia.pdf
    • https://s3.amazonaws.com/wulagisi/calendar_ortodox_mai_2018.pdf
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_f26bcc781e6d4149a5b855331624838b.pdf?index=true
    • https://s3.amazonaws.com/punagilelabon/98600668491.pdf
    • https://s3.amazonaws.com/pevarijidasalop/best_sword_type_for_combat.pdf
    • https://s3.amazonaws.com/begijufadi/kenmore_he2_plus_error_code_sd.pdf
    • https://s3.amazonaws.com/fizaxo/attack_on_titan_season_4_episode_2_release_date_netflix.pdf
    • http://fazejilijir.epizy.com/woreloseduviwum.pdf
    • http://nudoritane.atwebpages.com/ayushman_bharat_yojana_file.pdf
    • https://f5d5bca3-0ffd-41e3-a77d-3d805a1e43e5.filesusr.com/ugd/4e23ca_fa83f71f4c0d48719106e4f14180d20c.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f069.bin
2a37a0a6c7bd80f8255d431bd3540ff2f4b3dda5bc0b55786419c21ecbc7c01c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF069 5592 bytes
font_01_sfnt_off0001035e.bin
62e34714643b426ea6e913189ff624b5e2f0489283125e9afacc927541969e45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1035E 11080 bytes

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