Malicious PDF — malware analysis report

Static analysis result for SHA-256 4824c359e4c7f33d…

MALICIOUS

PDF

65.2 KB Created: 2021-02-04 16:19:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c3e4aa3b99a72f71c4c2aeb7cece131 SHA-1: 2e3e0bd8c9f46cf20ed0fa31a533ebe2c84910ae SHA-256: 4824c359e4c7f33d9d71e5fed5b5fd4801a1465c38659ce82e6b3f5e2d52742b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable domains or link farms, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated and contains metadata related to its creation tool, but no clear textual 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://druttle.ru/123?utm_term=cap%2527n+crunch+berries+nutrition PDF link annotation
    • https://cdn.sqhk.co/sovokeduseb/mifeEgj/13837802697.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418381/normal_5ffb22e113f06.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451750/normal_601bbd8b16f84.pdfIn PDF document text
    • http://cactusvpn.live/51267222154qx0wn.pdfIn PDF document text
    • https://cdn.sqhk.co/lorotukogof/cibRjh4/bevakanamowijunefufened.pdfIn PDF document text
    • http://glawerry.online/temperature_conversion_worksheet_celsius_to_kelvin603do.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_601b984ec5084.pdfIn PDF document text
    • https://cdn.sqhk.co/bozawenibiwa/YLgceQs/fezutimifiboxasidubi.pdfIn PDF document text
    • https://cdn.sqhk.co/wepuvumug/BfsFgeH/adverse_event_reporting_fda_medical_devices.pdfIn PDF document text
    • http://matteset-spon.space/migususumosezovooth2.pdfIn PDF document text
    • http://shortsomfj.space/diagrama_de_fusibles_jetta_a4_en_espaC3B1olu14xx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369643/normal_60020ca795bd1.pdfIn PDF document text
    • http://marafonsport.site/chac_mool_carlos_fuentes_rsumen3sq.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ehg2hjg/mejiwinaror.pdfIn PDF document text
    • https://cdn.sqhk.co/tomibigi/jeuwiem/pacific_navy_fighter_c._e_mod_apk.pdfIn PDF document text
    • http://gufutaca3.xyz/tavefeweyffoo.pdfIn PDF document text
    • http://therarbooks.com/best_song_ringtone_free_download_zedgecp4w2.pdfIn PDF document text
    • https://cdn.sqhk.co/guwuweri/VjhoJI7/translate_portuguese_to_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/dejuxafe/jcCN6In/duzojufezivomosisexerin.pdfIn PDF document text
    • http://aicberg.net/free_video_download_youtube_june_20164chy.pdfIn PDF document text
    • https://cdn.sqhk.co/mepawoworu/Akhd4hh/81502387783.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC126 5068 bytes
SHA-256: cff5d67ac6769c8fa355c56e0eb887eab3ec13e4bfbdd59a5e0a1a429e8e9200
font_01_sfnt_off0000d253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD253 10600 bytes
SHA-256: 510e5d31037a7c6ad57c1a8eb8a205383ac412fd9793061a23a607d01decdd76

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