Malicious PDF — malware analysis report

Static analysis result for SHA-256 5995738ec78e6361…

MALICIOUS

PDF

89.0 KB Created: 2021-03-21 09:42:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2f8e1f1e61e1dbb08a4f75dd2e0837d6 SHA-1: f5e66cdf635292b6c591798cd09301cc4086c5ee SHA-256: 5995738ec78e6361d84a40a57aa3cafd469fa99e6eb18729a0e71c9e87c30f7c
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, with several pointing to suspicious or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a deliberate effort to create a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/123?utm_term=hp+440+g6+datasheet PDF link annotation
    • http://dommasters.site/were_there_any_books_left_out_of_the_bibleftmdd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379854/normal_5fe13d798ad53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415526/normal_60298e8f94d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_6056d38c651f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fd306868e75a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485810/normal_600add63d6156.pdfIn PDF document text
    • http://ximikilanad.22web.org/breakdown_of_the_bicameral_mind.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484364/normal_5fdc03d8ab2d7.pdfIn PDF document text
    • http://zelopaqq.xyz/ver_aliados_online_latino6kx98.pdfIn PDF document text
    • http://remont-pc.website/animators_toolbar_pro_freeg7x88.pdfIn PDF document text
    • http://hightrade.club/dark_souls_2_dlc_armorehzib.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501996/normal_6054421db16d1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449193/normal_600930247a986.pdfIn PDF document text
    • http://verifiedbadges-form.com/game_of_thrones_book_collection_hardcoverxn85n.pdfIn PDF document text
    • http://dabuxupufudina.22web.org/dmaic_report_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453134/normal_6024133756e51.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372377/normal_5fe49a3bc0181.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/f6524444-0b6b-4a55-b927-22ccc4a80bbc/dolanasukalozobunutativuf.pdfIn PDF document text
    • https://s3.amazonaws.com/takurugilij/electron_affinity_halogens_chemguide.pdfIn PDF document text
    • http://kusuganuxe.epizy.com/moniciones_domingo_xxiv_tiempo_ordinario_ciclo_c.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/51470224647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31973a79-846b-42ee-90c2-374539a2e9ea/what_day_does_the_mandalorian_come_out_in_australia.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/dd_beyond_wizard_spell_list.pdfIn PDF document text
    • http://mafibiw.rf.gd/agriculture_urbaine_au_maroc.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_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 5436 bytes
SHA-256: d8a14b6dd3f2542225edac15ca4c9073de97fc5ceff1ff7f1784213fb849b4b5
font_01_sfnt_off00012c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C9D 11924 bytes
SHA-256: b4dae47c6c4c546afde6e84916243f8b41d2c7ad86dc1aa317280a510fb7839f

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