Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4637ef509894fcd…

MALICIOUS

PDF

74.8 KB Created: 2021-05-06 03:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 34bb32cd7ac6052fb3f854d6af09512e SHA-1: 725a20575b0a667225fc6f23994d92a0288249c0 SHA-256: d4637ef509894fcd30458ebce881dbac19c2d2e7b13623b4144aa61248aad031
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body, though heavily obfuscated, suggests a lure related to free movie streaming, aligning with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/strik?utm_term=la+ciudad+de+las+bestias+pelicula+online+gratis PDF link annotation
    • http://dezimazokuxulil.mygamesonline.org/fififudi.pdfIn PDF document text
    • http://likelid.xyz/mewububofnfwu.pdfIn PDF document text
    • http://pusulij.22web.org/beiimaan_love_full_movie_480p_khatrimaza.pdfIn PDF document text
    • http://wifunagidoli.mypressonline.com/examples_of_air_borne_diseases_in_plants.pdfIn PDF document text
    • http://copyrightshelpcenter.com/59917392938lmz2f.pdfIn PDF document text
    • http://starkrobotics.org/domimukopajisbl35.pdfIn PDF document text
    • http://vutunema.mypressonline.com/chronicle_of_a_death_foretold_chapter_4.pdfIn PDF document text
    • http://wabitolukarile.22web.org/darivudurowe.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/zinudipir/38889079938.pdfIn PDF document text
    • https://16564176-4c62-44d7-82e3-1dea6b832d73.filesusr.com/ugd/5e57cf_85106d2d0feb4f44bc338c77aef25883.pdf?index=trueIn PDF document text
    • https://ab737b70-891a-4a1f-8db9-ee548211cb31.filesusr.com/ugd/ce14f3_7b8ed838f0f1466bac4c3c63b15f3af3.pdf?index=trueIn PDF document text
    • http://vekemelegewimo.atwebpages.com/tipos_de_comunicacion_humana_verbal_y_no_verbal.pdfIn PDF document text
    • http://jipudovisubu.rf.gd/rockwool_ablative_coating_data_sheet.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_8b55b270e65f460bb758df52dd62c8c9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/dilesimikigozelejivokuj.pdfIn PDF document text
    • http://nixelotiseze.epizy.com/95790680884.pdfIn PDF document text
    • http://zezevefo.rf.gd/sonic_all_stars_racing_transformed_review_ign.pdfIn PDF document text
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_7b6f0a03486042a7a269ae642ef27036.pdf?index=trueIn 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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 5320 bytes
SHA-256: 7fda1429a1eff43f618cf4c700850891278889132ed7320769b06463d05e1508
font_01_sfnt_off0000f307.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF307 12776 bytes
SHA-256: 0343dd3d55647f20ea294a15177b1b102aef6fa7b2c38da88d3ae8d6e27d4942

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