Malicious PDF — malware analysis report

Static analysis result for SHA-256 88efcf6477b9ad8e…

MALICIOUS

PDF

76.8 KB Created: 2020-11-10 04:59:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 808ba9a95e200d5ee241c6aa0c6f62a9 SHA-1: 1d8c683f94be9cd29ac30af5fdf403f9ae17a33c SHA-256: 88efcf6477b9ad8e6a4b9d06bf9995f40b4c4c36994a1964f081e3469930f246
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?keyword=ffxiv+eureka+leveling+guide+4.4 In PDF document text
    • https://wuwenivavubujer.weebly.com/uploads/1/3/1/4/131437756/730ba5f58ef18c.pdfIn PDF document text
    • https://lawepisofav.weebly.com/uploads/1/3/4/4/134473025/3836966.pdfIn PDF document text
    • https://damijuvik.weebly.com/uploads/1/3/1/3/131381376/duviviligazofaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fa9df0a9d0c6.pdfIn PDF document text
    • https://towajusuw.weebly.com/uploads/1/3/4/5/134521237/3887172.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369508/normal_5f9bd21a009ca.pdfIn PDF document text
    • https://kekerisasil.weebly.com/uploads/1/3/0/7/130775365/kegasawuba.pdfIn PDF document text
    • https://gazofifato.weebly.com/uploads/1/3/4/4/134496451/62dd098a.pdfIn PDF document text
    • https://nalatuzub.weebly.com/uploads/1/3/4/3/134324595/nixiri-konejozo-gexojajadu-voforijomafof.pdfIn PDF document text
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/kazenegefawo-damimilotoko-rofazulo.pdfIn PDF document text
    • https://xonimitofowe.weebly.com/uploads/1/3/2/6/132682232/4380478.pdfIn PDF document text
    • https://taxufizewafodo.weebly.com/uploads/1/3/4/4/134477277/fufipumonibutorezoxu.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
    • https://uploads.strikinglycdn.com/files/fc7abf41-2129-417a-be5d-cfc6c26863af/ninidavomegowofopex.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/jezurelijibi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE195 4856 bytes
SHA-256: a887471b46f280b64c11ff252fe3f298d4f70c3c196086c95aa8f0199c2ec1f3
font_01_sfnt_off0000f236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF236 11452 bytes
SHA-256: 0494aa479839129ab6b4ac1d23270a6963db6c7a1fe501c1d9526f313a8bd412
font_02_sfnt_off00011848.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11848 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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