Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4036fff02c96bc9…

MALICIOUS

PDF

82.1 KB Created: 2021-04-03 00:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: eb3dac1585bdf4f4e6544c3aaa012cd0 SHA-1: 1be39527b89dbde398d4e938414234f8def818e8 SHA-256: e4036fff02c96bc91aa93d67681e8d6ab2dc5ebe4dc44fc4caf9418cd980ce76
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics strongly point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://nipisod.ru/strik?utm_term=is+paintball+open PDF link annotation
    • http://jofigapowewumaw.22web.org/candombl_da_bahia_roger_bastide.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/7730889895.pdfIn PDF document text
    • http://fadewujetenuve.mywebcommunity.org/can_rahu_be_atmakaraka.pdfIn PDF document text
    • http://jusukigib.sportsontheweb.net/vuremomev.pdfIn PDF document text
    • http://kitufavurakural.iblogger.org/kefujutokerofekuzoma.pdfIn PDF document text
    • http://triple-doska3.club/among_us_gif_wallpaper_get_off_my_phoneh13k5.pdfIn PDF document text
    • http://vozajomaralamer.mygamesonline.org/babysitting_resume.pdfIn PDF document text
    • http://copyrightsupporthelpcenter.com/bemapakeji0co.pdfIn PDF document text
    • http://anyita.space/supply_chain_risk_management_definitioncmt0a.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://faxevimisosideg.myartsonline.com/bodybuilding_workouts_free_download.pdfIn PDF document text
    • http://jomewuborova.rf.gd/winter_cycling_training_plan.pdfIn PDF document text
    • http://zawofepak.epizy.com/problem_solving_examples_for_performance_review.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/vorowavituwemorarodalugip.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/pazitinonepezesufoju.pdfIn PDF document text
    • http://safutid.epizy.com/the_homestead_act_of_1862_worksheet_answers.pdfIn PDF document text
    • http://wuzatefiroko.epizy.com/android_system_apps_running_in_background_notification.pdfIn PDF document text
    • https://s3.amazonaws.com/bexolamabad/jijikere.pdfIn PDF document text
    • https://s3.amazonaws.com/zoluwivebiro/jawodoxes.pdfIn PDF document text
    • http://wekapalipewux.epizy.com/29925620994.pdfIn PDF document text
    • http://kenesowozowojaw.myartsonline.com/bop_blowout_preventer.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/captain_america_endgame_hd_wallpaper_for_android.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_off0000f814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF814 4580 bytes
SHA-256: b2ee4731f76e8844543e93cb51477c2950460026b3f2f11a1ef8546eed3e65b0
font_01_sfnt_off0001079a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079A 11172 bytes
SHA-256: e7f9ad1dd7a7bec743f0fdf190aaca3ed4f03aa5be731408bb0879de6b5c3758
font_02_sfnt_off00012d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6B 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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