Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c64fb6867b52c0…

MALICIOUS

PDF

81.6 KB Created: 2021-02-26 12:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: ed1eca3b049dbc4ed723f0f913a8cfcf SHA-1: 32da21f8d68851b434b7efe871ee5e6ce69fdf5c SHA-256: 65c64fb6867b52c0fcb3a139102214e6b87ff074226c02f47e2e23c6c820c6ea
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The embedded content, though heavily obfuscated, appears to be a lure related to recipes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://baarspo.ru/strik?utm_term=can+you+make+a+ham+in+a+roaster+oven PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4423715/normal_6024996f7f249.pdfIn PDF document text
    • https://fowuwulavo.weebly.com/uploads/1/3/4/7/134754099/2132845.pdfIn PDF document text
    • https://fipaziditude.weebly.com/uploads/1/3/4/4/134465794/1766192.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453342/normal_5fdd68834cba4.pdfIn PDF document text
    • http://housefashion.ru/90639085983ol5m1.pdfIn PDF document text
    • https://cdn.sqhk.co/zogobadakedu/ihOwTAx/gagogonujakosa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_600f9e55bef3f.pdfIn PDF document text
    • https://cdn.sqhk.co/jiguluzufuwa/jbgjsia/tip_top_poultry_inc_zoominfo.pdfIn PDF document text
    • https://cdn.sqhk.co/renerolodepu/cihgi2g/viromogukexumiraju.pdfIn PDF document text
    • https://cdn.sqhk.co/mupalewefe/V2Pmigq/cupcake_recipes_choc_chip.pdfIn PDF document text
    • https://gukapubukon.weebly.com/uploads/1/3/4/1/134108909/8171ada.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/tjchfhj/new_alert_sounds_for_iphone.pdfIn PDF document text
    • http://ueuniti.xyz/44409833886u0ni1.pdfIn PDF document text
    • https://poduxerot.weebly.com/uploads/1/3/0/7/130776630/tonokutafusola.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 5024 bytes
SHA-256: 4f0a54a513f64ba82d8c5fb0902eea9df83d4e708a145d07c017966757cb9024
font_01_sfnt_off000114c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 10772 bytes
SHA-256: 4720d49b0d8c3fc78589d2c853ea531aca45f2062eceb441e7047faac0a4f5cb

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