Malicious PDF — malware analysis report

Static analysis result for SHA-256 88da4f1c60dec6b2…

MALICIOUS

PDF

66.7 KB Created: 2020-11-10 07:24:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 1e41a4013095f17e1304512f92c59830 SHA-1: de32eed767041201a92c1edb2d54c036677bbd56 SHA-256: 88da4f1c60dec6b2d0f7a9f58ecfbeef55f07d44abfccf1d6321ae37f0da9dca
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffi.ru/strik?keyword=utf8+to+hex PDF link annotation
    • https://bibeliki.weebly.com/uploads/1/3/0/7/130738572/loxolu-lekudopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387713/normal_5fa4aa3e3ec05.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/165648.pdfIn PDF document text
    • https://widavobixi.weebly.com/uploads/1/3/4/4/134494271/7beed402db9fa.pdfIn PDF document text
    • https://kobigaxa.weebly.com/uploads/1/3/3/9/133997295/4830400.pdfIn PDF document text
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/wadebulodanoluv.pdfIn PDF document text
    • https://jefogozadiz.weebly.com/uploads/1/3/4/0/134040800/vulesurokinogol.pdfIn PDF document text
    • https://pegelukiratek.weebly.com/uploads/1/3/4/5/134503056/tuxisevog.pdfIn PDF document text
    • https://fujamimoxelak.weebly.com/uploads/1/3/4/6/134601663/bc1204d7aaaf8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9fc4ef98-b9a7-4fd9-aedd-81e2e6cf1e35/podanifazujebe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d71bd71-b0fa-4d71-9d4f-9d40d4eba80a/29896680835.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d9335a4-6977-43b9-8758-3c2b73f69982/kit_pvp_servers_bedrock.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_off0000c942.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC942 4592 bytes
SHA-256: 8ee6e47d7d02d08aaeb304a5f0adb498e8a6b405d46e23ac1a26e365ebc52ddb
font_01_sfnt_off0000d8f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F3 11920 bytes
SHA-256: a53ee0c86d08ef086e2b28d7c141eca248141b5183f7b2699031c0f9ed6aa1a2

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