Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6056a4b7ac1302e…

MALICIOUS

PDF

77.6 KB Created: 2021-03-27 22:38:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bc09f35d534c36e0a8179ccaddb5ba1f SHA-1: a3d8b876d2ad1428404571a8999d788c6ea129f5 SHA-256: d6056a4b7ac1302e22941f6c269898a4fd25e5ded4faee47efe879c9bb9f6ffc
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm, and is flagged by ML classifiers and ClamAV as malicious. The embedded URLs suggest a lure for SEO spam or phishing, directing users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://leonvi.ru/wix?keyword=lion+king+online+free PDF link annotation
    • https://dolojimopa.weebly.com/uploads/1/3/4/8/134887070/4358604.pdfIn PDF document text
    • https://cdn.sqhk.co/gegojagakexu/hWkibij/digikey_molex_connectors.pdfIn PDF document text
    • https://cdn.sqhk.co/bivuwusim/hpXoZDy/zombie_prison_escape.pdfIn PDF document text
    • https://neminijovasagig.weebly.com/uploads/1/3/4/6/134603544/sarego.pdfIn PDF document text
    • https://cdn.sqhk.co/puxolika/NjgfjiA/jewidigibodanuwo.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/anglican_liturgical_calendar_2020.pdfIn PDF document text
    • https://pexafibilo.weebly.com/uploads/1/3/4/4/134484824/ranobulugav_tugebux_rojarodapol_wokajananupemu.pdfIn PDF document text
    • https://nanezafukixepa.weebly.com/uploads/1/3/4/5/134526153/144532.pdfIn PDF document text
    • https://titevajap.weebly.com/uploads/1/3/2/7/132741099/4004704.pdfIn PDF document text
    • https://cdn.sqhk.co/gigemuji/F1t6Che/subway_surfers_promo_codes_2019_coins_bali.pdfIn PDF document text
    • https://cdn.sqhk.co/sisuriwul/9hf0u7n/18251888043.pdfIn PDF document text
    • https://mawobomogagot.weebly.com/uploads/1/3/4/1/134109187/5702550.pdfIn PDF document text
    • https://rebomavarel.weebly.com/uploads/1/3/4/8/134883959/diziwujep.pdfIn PDF document text
    • https://ginadilu.weebly.com/uploads/1/3/4/7/134768391/21fc0b8.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/YjbFjdS/piggly_wiggly_book.pdfIn PDF document text
    • https://cdn.sqhk.co/tivanosox/e4ijb2X/xemobuzelemazelog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6f2fb29c-15f2-4b08-b525-3eb91a7f0a41.filesusr.com/ugd/c3548c_d985d20c59ef4749a946536bd82b0872.pdf?index=trueIn PDF document text
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_df5ac20063b146f2867776b1a4faa076.pdf?index=trueIn PDF document text
    • https://6f81cef9-66a2-447d-9e1d-4c0427ef15c5.filesusr.com/ugd/4d935e_8b012682b0904eafa05d290329a6fc69.pdf?index=trueIn PDF document text
    • http://marurutefa.atwebpages.com/jalafoxebu.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_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 4552 bytes
SHA-256: ada1fd8654818eeb5399d7b742638066e4ea3dcc6fccab3d58f6b34d20ed2e29
font_01_sfnt_off0001037c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037C 11020 bytes
SHA-256: 59ccb7f725396155a6fd35cdd29b1d59e8916a439c6755ed773ce625a3063669

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