Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d11d33cb0f3b6f9…

MALICIOUS

PDF

98.9 KB Created: 2021-03-10 05:11:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 310eb8350de2a4e1247f9b35ddd96962 SHA-1: 8238e0a641898267e309eaf9efcb012c6e019f21 SHA-256: 4d11d33cb0f3b6f9be61b410e349c4f877b2c5d254cd6c41c6e0de19a597ce72
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or malware delivery attempt. It contains numerous links to disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body, though heavily obfuscated, appears to be a lure related to medical research, likely to trick users into clicking the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://xezojetit.ru/award?keyword=tumor+angiogenesis+therapeutic+implications+pdf PDF link annotation
    • http://bluhgang.best/what_are_circuit_symbols_used_for94ybv.pdfIn PDF document text
    • http://sakipewo.22web.org/band_of_brothers_stephen_ambrose_epub.pdfIn PDF document text
    • http://shortsomfj.space/applied_informatics_software_engineering_gmbh2169b.pdfIn PDF document text
    • http://metinozub.iblogger.org/life_fitness_95ti_treadmill_new_price.pdfIn PDF document text
    • http://hyipinvest.site/ba_bs_formunda_vergi_numaras_olmayanlarw4yxa.pdfIn PDF document text
    • http://murupewobot.iblogger.org/dynasty_miia_sheet_music.pdfIn PDF document text
    • http://rafuzigukogare.22web.org/samsung_m2835dw_toner_singapore.pdfIn PDF document text
    • http://mitatizizuje.mypressonline.com/narabuv.pdfIn PDF document text
    • http://bovakepixoworax.iblogger.org/what_is_wrong_with_my_dyson_hoover.pdfIn PDF document text
    • http://fojukivijivik.medianewsonline.com/does_goat_simulator_have_online_multiplayer_ps4.pdfIn PDF document text
    • http://sallehub.xyz/why_is_the_water_in_my_samsung_fridge_not_coldtgbut.pdfIn PDF document text
    • http://losqutoq.online/zozekefasemisuv6zr9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nokejufesuw.atwebpages.com/what_is_error_5_on_one_touch_ultra_mini.pdfIn PDF document text
    • http://moxapowi.myartsonline.com/coreano_de_corea_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b337fecd-c315-4fc1-a19f-1dc1e8b3923e/shaolin_soccer_kung_fu_fighting_song_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a791e600-b9a7-49ae-9b5c-00db2a3aafc2/orbit_irrigation_manual.pdfIn PDF document text
    • http://nufufud.epizy.com/26110591247.pdfIn PDF document text
    • http://zovagesilamijuj.epizy.com/40530986011.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e84a374-3cf9-4ad6-804f-f57c14145b5f/batman_the_dark_knight_returns_part_3_the_master_race.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07f22ad5-a4d9-4eeb-a04a-c58c0496c9c5/chick_fil_a_nutrition_facts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa8204a1-cec0-4981-a33d-cf2ddbaa5241/arris_tm822_admin_login.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/318bbfbd-426b-4818-8996-ca2f2577d113/catch_me_if_you_can_musical_bootleg.pdfIn PDF document text
    • http://bumusilofinufaf.rf.gd/49413795625.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5aebf980-30c3-4a47-8842-6ac8f753eaca/romeo_and_juliet_act_1_scene_1_quotes.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_off000147e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E0 5516 bytes
SHA-256: 599a07187fd9211081ddfa3cfd578e196b7c60a94b8280f72052f90713513478
font_01_sfnt_off00015a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A78 10420 bytes
SHA-256: 4513cdb4ef482e94020c4d219ed9d10053db9c1864c081edd41ea62616cacfcf