Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c5918b83459a3df…

MALICIOUS

PDF

63.7 KB Created: 2020-12-06 07:09:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 65f7e96e8dcae0dc64575daf89f37922 SHA-1: bfab3bdbc92954563236b315961e75c1e5f20bc7 SHA-256: 8c5918b83459a3df2c4c0a514a54784f530643176ef567e717dcc08a2748950e
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://traffset.ru/strik?utm_term=mr+g%2527s+storage PDF link annotation
    • https://numuzobiw.weebly.com/uploads/1/3/4/5/134589566/1228656.pdfIn PDF document text
    • https://dofikusoru.weebly.com/uploads/1/3/4/4/134472045/2e83bcf.pdfIn PDF document text
    • https://wubenigulusetib.weebly.com/uploads/1/3/4/7/134712949/tekujafamokik.pdfIn PDF document text
    • https://dadekojulaza.weebly.com/uploads/1/3/4/3/134320805/zubenib.pdfIn PDF document text
    • https://degumikiw.weebly.com/uploads/1/3/4/7/134724061/72463f1abfe612.pdfIn PDF document text
    • https://peketodofow.weebly.com/uploads/1/3/4/5/134589962/gisaxamekurulaletup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc556d5df132613bbdb1115/t/5fc86d0e970db930d9c0bee8/1606970639370/jaguar_telugu_ringtones.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/851434f9-9293-412e-a4a1-21a21cfa3e96/asmaul_husna_lengkap_dengan_artinya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96e3509d-0663-4648-8c69-04ce123407f6/tewogagejebawebawal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84527b57-85b3-45d4-905c-5028aaaf7b33/34792522657.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0f27ea13a450babf44921/t/5fc130d14f983757200abc6d/1606496465503/54085701331.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe067f3570fb44d1ca0eeb/1606289023732/supplementary_and_complementary_angles_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d4c7c3-4031-41fe-b3e5-4cb7c45391b3/4942456224.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe07eda97599144ebe9404/1606289390975/ramana_maharshi_telugu_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59762747-b777-4ed5-9c36-6362fef140b3/action_verb_and_linking_verb_exercises.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_off0000be1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE1E 4860 bytes
SHA-256: 15aa2e2e1a1890ab9bf54bfadbee0ec301fa206b454cc9404f956356e82b5c59
font_01_sfnt_off0000cec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEC7 10672 bytes
SHA-256: fd1bdb581a59f35f9a9e81d692001694fe1c7a31c54a8705a6e6916088d1e218

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