Malicious PDF — malware analysis report

Static analysis result for SHA-256 f99db5d0fc0aa66f…

MALICIOUS

PDF

75.1 KB Created: 2021-02-15 14:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ecc5cf8efc520788d0f1c8720fe02b99 SHA-1: e23cacc1d9bc0f7f8317ff5e90bea05ff72b7039 SHA-256: f99db5d0fc0aa66f1b98f5af175cfb10e88ed09b84697f98d24a30091df8f86a
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://bologen.ru/strik?utm_term=sunquest+pro+20s+tanning+bed+reviews PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465685/normal_5fdbc6832c537.pdfIn PDF document text
    • https://bopojebokup.weebly.com/uploads/1/3/1/4/131408204/mekigotanebak.pdfIn PDF document text
    • http://vereffka.xyz/ax_3_domaines_meteo_15_joursjlkdn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414515/normal_5fec550ae0c56.pdfIn PDF document text
    • http://frut-tree.site/light_waves_physicsc358z.pdfIn PDF document text
    • http://baxijemapuzoxu.22web.org/excel_vba_activesheet._protect_allow_filtering.pdfIn PDF document text
    • http://reduslim-ordina.site/bavobiradarl5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462362/normal_5fd3daab55bbf.pdfIn PDF document text
    • http://reduslim-officialsite.site/jiffy_all_purpose_baking_mix_cake_recipeos28y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_60246c6084b8c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387928/normal_5fc59a1a0c72a.pdfIn PDF document text
    • https://vefoxetewezelir.weebly.com/uploads/1/3/1/4/131483279/gokokumew_levalibituvo_pivizaraj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415055/normal_601421dda670c.pdfIn PDF document text
    • http://swast-group.website/24477518892daari.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387709/normal_5ff6148fdf65f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373241/normal_601c9d435b536.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_off0000e618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE618 5892 bytes
SHA-256: 341b4307b47bb7fe7c8f945626d9104f21d8b5e8f6667cbd68d30c112aad5296
font_01_sfnt_off0000fa30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA30 10792 bytes
SHA-256: c12ea0afb2a03243d1a4b0f6de0d02fac95af8097a0f0596498a2432340214c7

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