Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae1b66db25ad571…

MALICIOUS

PDF

69.2 KB Created: 2020-11-30 02:56:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: e8f7dfd04af44291c8529c118908284b SHA-1: 10380f0c92f5b1dcd809a22a81b2ecd4b200eb53 SHA-256: dae1b66db25ad5715063cfc2ff859b9871996f6b6655618a5016ab914b446612
186 Risk Score

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-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://traffine.ru/123?utm_term=indian+echo+caverns+in+pennsylvania PDF link annotation
    • https://wowujisalot.weebly.com/uploads/1/3/4/3/134349860/81554b.pdfIn PDF document text
    • https://vejesare.weebly.com/uploads/1/3/4/4/134493146/b24e639fd.pdfIn PDF document text
    • https://wepoduxusuduxi.weebly.com/uploads/1/3/4/3/134306179/39d4f00b91b.pdfIn PDF document text
    • https://namonizumus.weebly.com/uploads/1/3/4/3/134345036/797cc7b0b.pdfIn PDF document text
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/85eba8.pdfIn PDF document text
    • https://guxedujigizos.weebly.com/uploads/1/3/4/7/134735137/wosisonulitil-foxakemabibi-zifitukonete.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gonavo/moxakewosodatederel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73ec5ba3-afed-429e-86a6-2c13aeba07ce/xunojamebigekixiwegomanis.pdfIn PDF document text
    • https://s3.amazonaws.com/gisujubolidine/95589466667.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38f281ae-440c-4bab-a382-0e304aab6af8/toolbox_for_minecraft_pe_apk_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c1c8bb7-e9ba-4cb1-8f4d-48be6f8151d7/32956931142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/767f2c1a-9d84-4af0-8e9f-5059939c4f7a/67550456717.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/227df8cc-2f25-4dfa-a4cc-8278bfaf3f67/83169653386.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_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 5260 bytes
SHA-256: c7f1176e51d6b7a4ce7ebde3f749da3dd5623f0e2bef3deeb4c7b360c62545d3
font_01_sfnt_off0000e3b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B7 10672 bytes
SHA-256: 919cdff8d69eb8483bd6ab8ede8ed73493b7d7affff93c982ae2951365a1d5cc