Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf400ba4fb8e471b…

MALICIOUS

PDF

80.9 KB Created: 2021-02-14 01:14:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1a927576937720312990cbd71c3edb37 SHA-1: 18c034afab5bf8b29fc2c9e234e23e15ed3311cf SHA-256: cf400ba4fb8e471b30c12467065178876fdd9ae3be103e9ae8d9fb8f65c1b0ce
126 Risk Score

Malware Insights

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

This PDF file is classified as malicious by ML and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, contains metadata related to PDF generation and search keywords, reinforcing the phishing pretext. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest the document is designed to redirect users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/wb?keyword=amharic%20dictionary%20book%20pdf PDF link annotation
    • http://kawojoxakinit.22web.org/mail_merge_google_docs_spreadsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/xowuzaseku/1jboXnK/doot_skeleton_png.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501495/normal_5fd3954ebe3c0.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/9284592.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381730/normal_60078f949d32e.pdfIn PDF document text
    • https://madugonado.weebly.com/uploads/1/3/2/8/132815119/31504fd068c2d4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385004/normal_601bba9f1ae69.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/30ca3ce0ca.pdfIn PDF document text
    • https://zalinojawovuga.weebly.com/uploads/1/3/4/8/134886974/punagojudujanu.pdfIn PDF document text
    • https://cdn.sqhk.co/musutalivun/wrVhgIc/92211224213.pdfIn PDF document text
    • https://xidoteruredogon.weebly.com/uploads/1/3/1/4/131454367/e904a3e9d50d.pdfIn PDF document text
    • https://cdn.sqhk.co/rosivapixove/LSijgic/faith_family_church_dunfermline_facebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413575/normal_6026c3a2c137b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415770/normal_5fded139685f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_602856471bde7.pdfIn PDF document text
    • https://cdn.sqhk.co/jugemito/pWG8fgc/78836167988.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451025/normal_5fca063461efb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://wivifizurata.epizy.com/sinergismo_y_antagonismo_en_farmacologia.pdfIn PDF document text
    • http://kijekamazeju.epizy.com/30690544747.pdfIn PDF document text
    • http://xuneviwek.epizy.com/26047063922.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22E 11924 bytes
SHA-256: a6f2a70520897c5405b7ec5292ec34be2722ddc45521d10bc7aec4b6be9e4ac8
font_01_sfnt_off0000f221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF221 5152 bytes
SHA-256: 1b4d3cfa652e4138bff7be784aadaf797c9f3349c515d30d888c89dcd4a26eed
font_02_sfnt_off00010373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10373 10364 bytes
SHA-256: b806d41d8280745a561bdaae48a96791432b5bccd96de525171dd55d2cd9125c
font_03_sfnt_off0001266b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1266B 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3