Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c36148855d6e484…

MALICIOUS

PDF

70.4 KB Created: 2021-05-02 13:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52e3d4ccb04b39a1ac6c5b6c9c986612 SHA-1: 3b6581d0fff945e3088bfe6363eeccbf5284ee31 SHA-256: 3c36148855d6e484e44a12eb80896f7f1eec6ca236361619c8c2917ad169f617
126 Risk Score

Malware Insights

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

The file is a PDF that uses a lure related to educational worksheets to disguise its malicious intent. It contains multiple embedded URLs, some of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing.

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://kuzutuzo.ru/strik?utm_term=1st+grade+cursive+writing+worksheets+pdf
    • http://zisesiso.22web.org/manuale_istruzioni_garmin_gps_72h.pdf
    • http://nofunaxo.22web.org/pomigepibi.pdf
    • http://copyrightproblem.com/the_carnivore_diet_shawn_bakeronite.pdf
    • http://limebago.iblogger.org/xuris.pdf
    • http://zuzezolimo.22web.org/77390577829.pdf
    • http://radewilagimalap.iblogger.org/how_to_reprogram_chamberlain_garage_door_remotes.pdf
    • http://snatural.space/free_video_downloader_chrome_browserfps2m.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wowonija.epizy.com/harrison_bergeron_short_story_sparknotes.pdf
    • http://sawokemapixaf.epizy.com/arihant_differential_calculus_free_download.pdf
    • http://tawowajukamabel.epizy.com/47414314004.pdf
    • http://pilojoduzige.epizy.com/vadisajixanuwaxatiw.pdf
    • http://zolusodo.epizy.com/lamabalitovi.pdf
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_110eb2a965e44a329c3987ad98d2499a.pdf?index=true
    • http://lizavobamibo.rf.gd/money_manager_badge_requirements.pdf
    • https://uploads.strikinglycdn.com/files/f05aaced-8927-43ae-bd86-6d469edab208/uppababy_vista_2012_rumble_seat_weight_limit.pdf
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_1f890a0ecf62409ba65ec0e78aa0e554.pdf?index=true
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_ce1374e4908c40c0921c2464f6f2d85a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/abaca2ee-d857-48c5-a81c-86db7738d77b/64175668786.pdf
    • http://godemesefiw.epizy.com/cahier_des_charges_pour_dveloppement_informatique.pdf
    • 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_off0000d760.bin
b3319401f6eb68503630accbbcbb15a39b351886230143f18f7c92da241921a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD760 5560 bytes
font_01_sfnt_off0000ea62.bin
5b77d55c047471a9021dc5e66b7418093ff8b1f0b5a7011406908ec21446b139		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA62 10096 bytes

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