Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ad1c4cdc2cd0ad…

MALICIOUS

PDF

82.4 KB Created: 2021-03-25 12:00:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdf4f7b39d839e3ae7dddd545b02df7c SHA-1: 7adca9ef329e371b8ed1b102220a8a8a517f7f5b SHA-256: c6ad1c4cdc2cd0ad05dddc7f96d7e7072e8b082b9da290562e4c5fe8f2449aba
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution 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://jumiwimov.ru/award?keyword=advanced+language+practice+michael+vince+pdf+vk
    • http://pogawubujogeje.mypressonline.com/lobiditazavuxinisuzova.pdf
    • https://cdn.sqhk.co/lamifiriluz/qTjegfZ/xupexezekelizopalole.pdf
    • http://lolegig.22web.org/4708312163.pdf
    • http://xebiniseba.mygamesonline.org/varezum.pdf
    • http://woxijakuzadajew.getenjoyment.net/troy_bilt_4_cycle_string_trimmer_leaking_oil.pdf
    • http://womukob.iblogger.org/52585624585.pdf
    • https://cdn.sqhk.co/nedivixozu/ghd5yii/mutagufosiri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sijadogif.atwebpages.com/80874791345.pdf
    • http://zubiluwetij.myartsonline.com/casio_g_shock_rangeman_black_panther.pdf
    • http://gedokimisizat.rf.gd/53907626236.pdf
    • https://s3.amazonaws.com/tarajix/strategic_management_notes.pdf
    • https://s3.amazonaws.com/mujesogi/novetid.pdf
    • https://uploads.strikinglycdn.com/files/21cdfb73-b965-42b8-b68a-c4f1b23c83fd/gibson_gforce_tuner.pdf
    • https://uploads.strikinglycdn.com/files/987ec638-1bd6-404b-b88b-4b7c92c2a83f/journey_to_the_west_full_movie_download_720p.pdf
    • https://s3.amazonaws.com/xebuvuwov/free_easy_drumline_sheet_music.pdf
    • https://s3.amazonaws.com/jevelel/65863863430.pdf
    • http://nisuzadusidu.epizy.com/pelicula_escritores_de_la_libertad.pdf
    • https://s3.amazonaws.com/luropiw/sap_abap_basics.pdf
    • https://uploads.strikinglycdn.com/files/f98cd257-2614-4c82-a928-debadcaf6019/how_to_learn_processing_bdo.pdf
    • https://2a4065d7-883d-43e8-a524-7ce9aa4b4e88.filesusr.com/ugd/ccb1c6_94a470e9ac134c708a1d2a4caabc5ad4.pdf?index=true
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_e62f6c94220c4de98bba8f14005232e2.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d7.bin
de509d8c927bb3abb5f9b420736fabc778da4c96be50076866d319f488673021		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103D7 5504 bytes
font_01_sfnt_off00011676.bin
6913ed6868d4203bc19e0b80c15ad7b21fd6dc806b2802ffd2a7a43619496dc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11676 11340 bytes

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