Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d546886db37c18a…

MALICIOUS

PDF

81.2 KB Created: 2021-03-23 19:23:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 5828690c99eb904ee3111d88bece1fc5 SHA-1: f4c4f0f264e8fe8b5d78a350d8e2c3ce8354f561 SHA-256: 2d546886db37c18a795546ad3c47e59e004ee16504065adbfa298a641a135164
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to distribute phishing or malware. The PDF's structure and the presence of external URIs strongly suggest it's used as a lure to redirect users to potentially harmful content.

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://jacksth.ru/strik?utm_term=whitfield+pellet+stoves+website PDF link annotation
    • http://nidewopovuwubo.mypressonline.com/applied_behaviour_analysis_autism.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/fjfcWrh/90880150319.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/V2Pmigq/cupcake_recipes_choc_chip.pdfIn PDF document text
    • http://lixejinokegiror.22web.org/41927607927.pdfIn PDF document text
    • http://roserubusigiwij.mywebcommunity.org/ncaa_division_2_basketball_regional_rankings.pdfIn PDF document text
    • http://kukikifo.iblogger.org/retefatidus.pdfIn PDF document text
    • https://cdn.sqhk.co/tizadufof/oqhibie/diy_hamster_cages_for_sale.pdfIn PDF document text
    • http://fodefon.getenjoyment.net/pierre_schaeffer.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476285/normal_5fc98fbda0a5a.pdfIn PDF document text
    • https://cdn.sqhk.co/zevukodixu/iep1ifu/miduxe.pdfIn PDF document text
    • https://cdn.sqhk.co/fabokofe/Z5ggcjS/gebikexunedupiwuvoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490519/normal_5fe8a7eff212b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446645/normal_5fc794585f8f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489609/normal_6019b03742274.pdfIn PDF document text
    • http://fexevewuli.mypressonline.com/fiperesa.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/95488d8c-fd95-4a3c-a8fd-0491fe154ec7/tejasasejabamovuto.pdfIn PDF document text
    • http://xafazox.rf.gd/punjabi_attitude_status_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8d56ddc-2808-4863-a979-c385fb53419e/6909362993.pdfIn PDF document text
    • https://s3.amazonaws.com/voropa/zaxamatowizerafibupipi.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/analyzing_and_interpreting_scientific_data_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/rupatojuko/how_to_sign_up_for_bge_peak_rewards.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_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 5128 bytes
SHA-256: bccc913f452875f012a7ebb0247225381f548ff4893d038fb596cd93183819f5
font_01_sfnt_off0001124a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124A 10948 bytes
SHA-256: c81671cee54b8c4dce1b61551e0927d1101f8d11f6dad7627f368d090c871507

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