Malicious PDF — malware analysis report

Static analysis result for SHA-256 c31699cdde889ef3…

MALICIOUS

PDF

79.2 KB Created: 2021-01-28 23:33:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3151c44c10852036f8887ecc4241db88 SHA-1: 12eb0d186c52f1c8caef454d26396f6ad26e177b SHA-256: c31699cdde889ef305bb8ba6b6fb8e28272d32303d15b82e113be345fe10967b
166 Risk Score

Malware Insights

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

The PDF contains multiple suspicious links, including one that is invisible and points to a domain designed to look like a security check. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and a link farm heuristic suggests the document is designed to redirect users to potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://baarspo.ru/123?utm_term=pearson+education+science+grade+8+answers PDF link annotation
    • http://atomyimperial.ru/gipofubikifevadorarawaxiv5wkw.pdfIn PDF document text
    • http://okrasote.info/sandwich_spot_menu_san_carlosr0g2z.pdfIn PDF document text
    • http://expressday.online/wrong_turn_7_full_movie_download_in_hindi_dubbed_300mblbbrj.pdfIn PDF document text
    • http://servicesforsupport.com/96794012780tdqaf.pdfIn PDF document text
    • http://sodobinefudiguw.iblogger.org/kenmore_progressive_canister_vacuum_repair_manuals.pdfIn PDF document text
    • http://unreguezff.rest/adoracion_al_santisimo_sacramento_del_altard4xah.pdfIn PDF document text
    • http://airbin.top/aluminum_fire_ant_colony_castingbcduv.pdfIn PDF document text
    • http://easylearning.space/nba_g_league_scheduleaof9o.pdfIn PDF document text
    • http://zinuxuf.22web.org/3142141907.pdfIn PDF document text
    • http://securitycheckingbrowservkcom.xyz/laveretogifekegjrqe.pdfIn PDF document text
    • http://waliwosodumobu.iblogger.org/rockstar_gta_san_andreas_free.pdfIn PDF document text
    • http://xifitubi.22web.org/gotham_bold_font_windows.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xesigeze/gangster_granny_3_apk_data.pdfIn PDF document text
    • http://zekovulelopur.epizy.com/capital_gains_tax_kenya.pdfIn PDF document text
    • http://bukumetaboxalo.epizy.com/einaudi_sheet_music.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_off0000f69e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF69E 5364 bytes
SHA-256: 97df42473e08e437d1c57b2f8f1109c3fa6a433398969fa18a66e976a9e01ac0
font_01_sfnt_off000108f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F4 11336 bytes
SHA-256: 82c508643552c30f06e4bba4c43fcb11cc7fbceaf98b25b452ae803a20a6588e

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