Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4754f0a2261889e…

MALICIOUS

PDF

71.1 KB Created: 2021-03-31 15:43:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4ff4ffa02267bba414591301fe3f4566 SHA-1: 7f67915ec2c47227ea2a74cc1d8ee7049254247d SHA-256: e4754f0a2261889e17a64b89c429028d44a708832d366201652c87f95532e913
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to potentially malicious PDF files, indicating a link farm designed to distribute malware or phish for information. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

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/award?keyword=plant+biochemistry+pdf+notes PDF link annotation
    • http://creditactive.info/zapabemegupefugug057ja.pdfIn PDF document text
    • http://getliterate.online/258719396960awc2.pdfIn PDF document text
    • https://cdn.sqhk.co/pesamelez/hzihjiv/bus_driving_hill_station_game_download.pdfIn PDF document text
    • http://kvrovk.xyz/what_is_a_logic_model_in_researchmmgwr.pdfIn PDF document text
    • https://tubuzitobez.weebly.com/uploads/1/3/4/1/134108618/pepinatowipe_panusinejisi.pdfIn PDF document text
    • https://cdn.sqhk.co/xavaxonad/j6gg13W/dabazitawepejijakageb.pdfIn PDF document text
    • https://cdn.sqhk.co/luwokiseg/wiiegjf/mobile_legends_adventure_cd_key_october_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/hfTXifi/33161329926.pdfIn PDF document text
    • http://prequester.online/android_1_bloons_td_battlesigrg2.pdfIn PDF document text
    • http://lnstagramverifiedbadge-form.com/ravipoxofixanudodjveat.pdfIn PDF document text
    • https://zewurutivuzaned.weebly.com/uploads/1/3/4/8/134888434/fedukajajifurewufo.pdfIn PDF document text
    • https://cdn.sqhk.co/pazakazagoz/hhdEihT/3d_yacht_boat_parking_game.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fae7dc80-9376-43e2-8559-e2e8df4929e7/balavopa.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/can_t_spotify_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fb22d22-77a4-4634-914f-647999d07088/91789947892.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/89417258945.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7164632-14ab-43ca-889a-3294ed0d091a/asma_ul_husna_atif_aslam_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b4c0156-56ba-44a7-ac08-a951c8ac6900/nuance_dragon_naturally_speaking_trial_version.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/templates_for_visiting_cards_free_s.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_off0000da3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3F 5640 bytes
SHA-256: 3c283b9ea951542a09877ed70f009694050b0da57ff9d4495dc074d2f48d8c9e
font_01_sfnt_off0000ed3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3E 10340 bytes
SHA-256: 47255534a7bd1435420c0adc597a1339f9a08e4e0d4d74c1acab537ce31cd19b

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