Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c88563d5a142dc0…

MALICIOUS

PDF

88.2 KB Created: 2021-01-21 06:24:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 53a9b371762169c8307f2cdf8759dd3c SHA-1: 8599ec2879d042a0add22207665b8afbe9e045a2 SHA-256: 8c88563d5a142dc0bda5ac50979dd90c2a4e3dff2af29bef6de133658e8d84fc
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, suggesting a phishing or SEO manipulation scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to potentially harmful content. No scripts were extracted, but the volume of outbound links is the primary indicator of malicious activity.

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/123?utm_term=mw3+glitches+on+dome+xbox+360 PDF link annotation
    • https://cdn.sqhk.co/gisusisabez/gjKhhid/fight_someone_up_meaning.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497078/normal_5fb4defaa35ab.pdfIn PDF document text
    • https://datokusowijodo.weebly.com/uploads/1/3/0/7/130776434/pibadelowu.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/ih6Sjba/descargar_maps_of_clash_of_clans_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365627/normal_5fbcbe9013f51.pdfIn PDF document text
    • https://cdn.sqhk.co/situdejoj/Ygfhigc/ratofenevat.pdfIn PDF document text
    • https://pelefazefipaguj.weebly.com/uploads/1/3/4/8/134892892/53dad50b9e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_5feb5436527a9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444648/normal_5fe298bcf3939.pdfIn PDF document text
    • https://gejekawuxo.weebly.com/uploads/1/3/4/4/134497426/477592.pdfIn PDF document text
    • https://cdn.sqhk.co/kagaxavog/hiCifij/pi_music_player_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/nivunufozub/32jegjf/27342216135.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://karatufi.epizy.com/getivugiwerebumosap.pdfIn PDF document text
    • http://xovipofeguz.epizy.com/kevesuf.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_off00011a72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A72 5812 bytes
SHA-256: 5bf0f7e5613566b194e9aba7180d05372caa9da21dd8b1c745b2ef860cb72a38
font_01_sfnt_off00012e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3D 10992 bytes
SHA-256: 6965a89a581f0a566e0c3fde9a8523caa1cc2511554733abac620bbc52d75256

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