Malicious PDF — malware analysis report

Static analysis result for SHA-256 20ec6d1778078f68…

MALICIOUS

PDF

78.4 KB Created: 2020-11-26 01:52:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ff40bd2e37267e20d11c009e2d7a3479 SHA-1: 536e89bf89a4571ebdfc4ed750a0f7eee38e1b25 SHA-256: 20ec6d1778078f687493ab6b81141d741eee3bb186f1d08006833c56e89e1770
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 0.9997

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
  • 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://trafftec.ru/strik?utm_term=amd+e1+1200+processor+equal+to+intel PDF link annotation
    • https://sawanizoso.weebly.com/uploads/1/3/4/6/134654845/9057261.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412891/normal_5f9b562b132b6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452609/normal_5fab69a241364.pdfIn PDF document text
    • https://bupifepubeweta.weebly.com/uploads/1/3/4/3/134336259/sexisomeja.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5fb495a902e75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484999/normal_5fae157f46df2.pdfIn PDF document text
    • https://xexonukomamub.weebly.com/uploads/1/3/4/3/134353621/dukagodinelulo.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/3606222.pdfIn PDF document text
    • https://lugafowak.weebly.com/uploads/1/3/4/6/134647172/derasepeba.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/7880e2b6-f6d0-4f88-815a-3c08568edb3e/48394110453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1848c9b-4a4d-432d-87c4-0f04b92e2a0b/79772092394.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/034b9d29-f954-46e1-b533-7bcd5c16969c/99261496738.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56366fac-b83d-4b2c-9621-e47189070bff/95034034662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f21cf58d-2449-4a4d-9d59-55e574fbcc86/87725049150.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/bujowedisobopupekul.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5660 bytes
SHA-256: b3833cb9b2147a439e4564a4be4d2ff7cf7baf1ace6535d59b3575d7bfd0f189
font_01_sfnt_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 12764 bytes
SHA-256: 57233e200fae8e942aa898eb39c8042c234ebc02bdc5c2a0fa680b6d2fcb1b7f

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