Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5384b888a7c105…

MALICIOUS

PDF

84.1 KB Created: 2021-04-04 05:42:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ccdc34668a60e733088ee3fa675e110 SHA-1: b6e17d067f7cb2221bf0b95b30021c2171d62988 SHA-256: df5384b888a7c1050bd2ff270a22d84b898f34a01e9cdcbaae7b59a1d0a2f9fc
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to potentially malicious websites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ponafet.ru/123?utm_term=cunningly+informal+definition
    • https://cdn.sqhk.co/fuludasowipu/EEgcDBh/83331100611.pdf
    • https://cdn.sqhk.co/lolumebitana/hiZjhsY/download_call_of_duty_mobile_apk_and_data.pdf
    • https://cdn.sqhk.co/serodozire/ONOjjhe/evoland_android_review.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitidadufetenu/does_the_pod_go_have_a_looper.pdf
    • https://s3.amazonaws.com/kegovev/project_x_hzrdus_smoke_yellow_vs_small_batch.pdf
    • http://pixoriwabivonol.rf.gd/tamil_new_movies_sites.pdf
    • https://uploads.strikinglycdn.com/files/a59f465d-7220-4984-bb70-cb6570905da4/american_standard_accuclean_user_manual.pdf
    • https://s3.amazonaws.com/gulapore/davubivegug.pdf
    • http://zarorabezogug.rf.gd/online_web_page_to_converter.pdf
    • https://f64a1a0a-debf-4843-a838-a34c0cae0f4a.filesusr.com/ugd/89602e_881e93408d70452b99f1ad8272560ac0.pdf?index=true
    • http://miwerigijeki.rf.gd/fewokubapowitaduloda.pdf
    • https://uploads.strikinglycdn.com/files/bd2c55aa-ec50-4a9e-8f62-a21fa1f9d2a4/how_old_is_king_seven_deadly_sins_in_human_years.pdf
    • https://uploads.strikinglycdn.com/files/ce2e1565-06e8-458d-89e4-567275d3c6d9/30509555497.pdf
    • https://s3.amazonaws.com/zetubakuz/love_chunibyo__other_delusions_ending_song.pdf
    • http://demiwadipojaz.epizy.com/68820831272.pdf
    • https://uploads.strikinglycdn.com/files/91a3358d-f7aa-4e5b-9bb9-61166c103efc/89538798377.pdf
    • https://aefbb2f1-1cfc-4a48-aab2-d72547d84173.filesusr.com/ugd/2f3ac6_cd5030b1b68d48dbbafd81502f39cfeb.pdf?index=true
    • https://uploads.strikinglycdn.com/files/fea4b369-679c-4e7b-a3c1-b1d188785096/meek_mill_book.pdf
    • https://uploads.strikinglycdn.com/files/e7d9426f-afa6-4acc-82a2-2e20ef40752c/71133953547.pdf
    • https://uploads.strikinglycdn.com/files/18856e6a-34ed-4c66-8050-8fd2db3bbb19/fobowigirifa.pdf
    • 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_off000107a1.bin
1f50897a6600e7731dbba7c868003362c2be073d988f5fbeb178851147253d17		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107A1 5056 bytes
font_01_sfnt_off000118c1.bin
6c67b7e46877691b3888ed4daef373b3cd3762e5876eebae0553a7e5080fd076		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 12268 bytes

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