Malicious PDF — malware analysis report

Static analysis result for SHA-256 e560e7749c55d1d1…

MALICIOUS

PDF

87.4 KB Created: 2021-05-09 13:01:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284de2a85b8d10237165b2d69200000d SHA-1: 9e70797fbb2b0b248c38b06cb4f76b0cd16911a5 SHA-256: e560e7749c55d1d1eaeaed215790c7d84462f364227ea928d6ef6ee14fb2276d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and link farm heuristics suggests the document is designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=bosch+dishwasher+silence+plus+46+dba+parts
    • http://pofizivor.22web.org/how_to_adjust_2_cycle_carburetor.pdf
    • http://9gusevshop.website/dia_primeiro_de_maio__feriado_de_qudck3z.pdf
    • https://cdn.sqhk.co/pijujuweg/fZ4YJZR/vector_addition_calculator_symbolab.pdf
    • http://wanulutipumik.iblogger.org/cave_story_3d_music.pdf
    • http://kapusta.pro/heat_n_glo_fireplace_service_near_mexjcv5.pdf
    • http://nokunejojepeje.22web.org/foxisotobowulekewufemurow.pdf
    • https://cdn.sqhk.co/fogunedevare/pIaUBjj/idle_landmark_tycoon_mod_apk_money.pdf
    • https://cdn-cms.f-static.net/uploads/4499984/normal_605a5e0253669.pdf
    • http://alcexpress1.xyz/dusejutimunenaxl254.pdf
    • https://static.s123-cdn-static.com/uploads/4382208/normal_5feb816a2090e.pdf
    • http://buzatukati.iblogger.org/sozewifovu.pdf
    • http://lnstagram-blue-badge-form.com/conscious_discipline_summer_training_20205p67b.pdf
    • http://fujuvujazapoko.22web.org/itunes_microsoft_store.pdf
    • http://ranking-se.com/mountains_of_madness_board_gameu4fdc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rokidibamufoduv.epizy.com/ascitic_fluid_cytology.pdf
    • http://goziwofa.rf.gd/internal_audit_certification_course_in_india.pdf
    • https://uploads.strikinglycdn.com/files/af1034aa-f29b-4570-88c3-cf61ceb7892b/viper_alarm_3105v.pdf
    • http://ragipop.rf.gd/site_reliability_engineering_how_google_runs.pdf
    • http://falalovoxiwada.epizy.com/akon_album_konvicted.pdf
    • https://uploads.strikinglycdn.com/files/a16c2329-8278-4d0f-bf69-b5ba8ecee349/75784654043.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_off0001143c.bin
dccc92e2c60f1b6c69a827ef5088c56b80bfa07cedd5f59262abf4f469ea85d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1143C 5684 bytes
font_01_sfnt_off0001279d.bin
979874c8741294cf3bcf2d2dde88c81218f604a7279a4c0a995b710bbfa6ad50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1279D 12020 bytes

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