Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0e17f1679f8ef45…

MALICIOUS

PDF

151.2 KB Created: 2021-04-01 20:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe0649242cf165fea93525a66ab64a19 SHA-1: 7c5fd59240e36c130b36fe755d9256cd45b5aadd SHA-256: e0e17f1679f8ef45a86bbd6f40f3c5d5d3e93a5ea71da4be665b629aad2c1100
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable or unknown domains, suggesting a link farm or phishing operation. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on potentially untrustworthy sites. The primary attack pattern involves redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://seumenha.ru/strik?utm_term=what+are+the+7+philosophy+of+education+pdf
    • http://normal-id.com/rifle_fallout_4m0wck.pdf
    • http://spainsale.pro/carrie_christine_stephen_kingsfbck.pdf
    • http://ziwegiwe.iblogger.org/ladenuveter.pdf
    • http://kapovulup.mywebcommunity.org/89923782954.pdf
    • http://mebelintera.ru/29078626767y148e.pdf
    • http://ziximotizaned.medianewsonline.com/convertir_de_a_word_descargar_gratis_espaol.pdf
    • http://dfahsdfgjsfg.online/first_things_to_do_when_taking_over_a_businessbyoes.pdf
    • http://zifezuguwimifu.22web.org/32855517292.pdf
    • http://vumogegotawugub.mypressonline.com/tapadubelaxukonomi.pdf
    • http://suwefazimim.medianewsonline.com/neoplasia_maligna_de_colon.pdf
    • http://copyrightsupportforlnstagram.com/fekivijazodikilof8m13.pdf
    • http://copyrightreports.com/joy_to_the_world_guitar_chords_key_of_gt8kw6.pdf
    • http://bodyita.space/kumezinisivuzubujoj7tyz5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gadegeganex.epizy.com/duxazedodor.pdf
    • http://zofawuzimiva.rf.gd/anatomy_of_lower_limb_veins.pdf
    • https://uploads.strikinglycdn.com/files/be986d94-aa63-458d-8952-3077e91794ca/altered_carbon_season_2_is_bad_reddit.pdf
    • http://lisirowi.rf.gd/77336250282.pdf
    • http://wejanofe.rf.gd/buonasera_o_buona_sera_formale.pdf
    • http://latuwukatagowa.epizy.com/master_swing_trader_toolkit.pdf
    • http://lozufoxozaniso.rf.gd/81853485293.pdf
    • http://wezekopufoj.rf.gd/south_beach_diet_review_blog.pdf
    • http://rarefovukafulu.rf.gd/what_battery_do_i_need_for_a_ford_focus_key_fob.pdf
    • https://uploads.strikinglycdn.com/files/40e17ea2-0b32-4f99-93f2-7dd9df979edc/retopob.pdf
    • https://uploads.strikinglycdn.com/files/f4282d81-2862-49de-b914-b3aa0af79adc/everything_explained_for_the_professional_pilot.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_off000212eb.bin
76738a621640418ac1dd139eba46b04b45d5bbbbf8217131c4316cb6f4099440		 pdf-font-stream PDF embedded font (sfnt) at offset 0x212EB 5436 bytes
font_01_sfnt_off00022580.bin
335bc9f19781f3d541457695186da455005f4a65df1e730b74ccd72c57552227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x22580 12272 bytes

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