Malicious PDF — malware analysis report

Static analysis result for SHA-256 9321407e8d780549…

MALICIOUS

PDF

60.1 KB Created: 2020-11-12 23:39:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 0e4e6fa8a5afb0eb24b9d028af417b12 SHA-1: dff0d067c11505ff95092429fe8e87bc0d38b704 SHA-256: 9321407e8d7805499cd62afa5a90c98ef4e25636f114ded908dfa0d3a67f3db5
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 0.9993

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://trafficel.ru/123?utm_term=elmo%2527s+magic+cookbook+trailer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403264/normal_5fa8ddfc95577.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/344e4c798ab.pdfIn PDF document text
    • https://sakukavazu.weebly.com/uploads/1/3/1/3/131379729/65f78c9b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377400/normal_5f98e889582cd.pdfIn PDF document text
    • https://fenolipemul.weebly.com/uploads/1/3/4/3/134341818/57c7fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372100/normal_5f897d1f8b7f4.pdfIn PDF document text
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/sofaratig.pdfIn PDF document text
    • https://xakabitugaret.weebly.com/uploads/1/3/4/3/134366923/7149096.pdfIn PDF document text
    • https://domamulobam.weebly.com/uploads/1/3/4/5/134527142/4248078.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/63a2111b-61f8-42d3-a111-8ce1e7f8674a/mekason.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d474b6bf-e6b0-4e69-887a-1406ce91960b/gabevabarojireximu.pdfIn PDF document text
    • https://s3.amazonaws.com/kexamoxusinixu/58620477996.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_off0000af4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4E 5316 bytes
SHA-256: d585f780a4a531c8a2a2083a009b8af6e9de31af134a3397eb6c8ef0b001abfe
font_01_sfnt_off0000c159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC159 10200 bytes
SHA-256: 45cb4d534146337de3a7ff50a04951ccd14018e9edfc115a05df8ea26549b767

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