Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5da42666f1d3097…

MALICIOUS

PDF

72.2 KB Created: 2021-02-19 16:09:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: c1f5c3ecb40874566b13d24ae8b677b8 SHA-1: e8e81fc9c333b62299a6fa4b63335864e1b655a8 SHA-256: c5da42666f1d3097d65cc90cdba8246a884d12b0bb99fba64a3676de6cb99043
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many pointing to disposable domains and configured as a link farm, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no direct user-facing text that would indicate a specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=the+good+lord+bird+air+date PDF link annotation
    • http://appless.space/benogojuboxafapu94y.pdfIn PDF document text
    • http://odebayitrafikhizmeti.com/fmtv_m1083a1_tm68a79.pdfIn PDF document text
    • http://trudogoliya.online/new_girl_ryan_godineaux_actorcntf7.pdfIn PDF document text
    • http://13millions.store/varumaxekomupidusixddxcs.pdfIn PDF document text
    • http://skameyki.club/96419721008xbnzv.pdfIn PDF document text
    • https://cdn.sqhk.co/kulobuwaxegu/ijjigc5/free_small_pc_games_for_windows_7.pdfIn PDF document text
    • http://deemonatrafik.xyz/crash_kart_racing_switchev797.pdfIn PDF document text
    • http://subonus.ru/pevewilbzjul.pdfIn PDF document text
    • http://cmbclientes.com/mad_at_school_summaryi7x7c.pdfIn PDF document text
    • http://net-klientov.ru/87239122692hghuc.pdfIn PDF document text
    • https://cdn.sqhk.co/zolaxadivowe/ijbqSm9/green_pepper_casserole_taste_of_home.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/petuzutemixuvod/wetagokobemirarumujo.pdfIn PDF document text
    • https://s3.amazonaws.com/fulosobezur/accordance_shelly_crane_portugues.pdfIn PDF document text
    • https://s3.amazonaws.com/jepavilutabilel/argentina_flag_hd_picture.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_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 4996 bytes
SHA-256: e7a1c9a45da2e990cf7fb1dacc009cb0c293ee9b089e539ec17fcb782e4428bf
font_01_sfnt_off0000ef2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2F 10732 bytes
SHA-256: d113e0fa048a3736c768c1c3b5d0dc267b00de31093dff1f350653c7c8849a0a

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