Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fa231c90a2c064…

MALICIOUS

PDF

69.8 KB Created: 2021-04-20 02:57:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b470cffd2bb7f163bb58970ba0a21ee SHA-1: ac8928e719fcda28328e0e541d3bfd83f5c3cc54 SHA-256: f9fa231c90a2c064f812ec01c0e4bb37b5c8fa8761d7655d174bdefcfd7ce89e
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV detection and ML classification indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8215

Heuristics 5

  • 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
  • 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://xajibur.ru/strik?utm_term=carry+on+luggage+size+international+flights+lufthansa PDF link annotation
    • https://sajurewuvow.weebly.com/uploads/1/3/4/0/134042423/figufide.pdfIn PDF document text
    • https://kusejatakobex.weebly.com/uploads/1/3/1/4/131438299/4684501.pdfIn PDF document text
    • http://rubarenuruvofi.iblogger.org/dometic_9100_power_awning_installation_instructions.pdfIn PDF document text
    • http://dixuzizu.iblogger.org/bruce_lipton_gratis.pdfIn PDF document text
    • https://kabigupux.weebly.com/uploads/1/3/4/4/134442156/papurelirapo.pdfIn PDF document text
    • https://kuduxuke.weebly.com/uploads/1/3/5/3/135323303/d6454ed2.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/gfiifvA/97341771414.pdfIn PDF document text
    • https://netigobulon.weebly.com/uploads/1/3/4/0/134096742/lofakef-tezezoranunoxid.pdfIn PDF document text
    • http://wivadanege.iblogger.org/descriptive_essay_writing_examples_for_college_students.pdfIn PDF document text
    • https://cdn.sqhk.co/nexoratuxi/RieojiR/wood_burning_art_ideas.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/tazopaju/most_popular_rpg_games_for_android.pdfIn PDF document text
    • https://99442e0c-e188-470f-b1e9-a2082f9e7f28.filesusr.com/ugd/2274a7_1d317a45c8cc4cf3b6fbf08880264e45.pdf?index=trueIn PDF document text
    • http://tamipaw.epizy.com/10826290113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4683633-9518-4d21-9f1e-d7ae25a3de8b/dimanured.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c660e61d-0bfd-4d1b-86f7-1c9cb19c9909/graphic_designer_job_duties_resume.pdfIn PDF document text
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_a0a7f8b57aa142cc97b057ab55ad3a92.pdf?index=trueIn PDF document text
    • https://c3f0ce02-b953-40d9-b94a-e38a054f9a35.filesusr.com/ugd/7afb62_ab93f7a83b544a959ab8548f8abded7f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudurat/best_calorie_counter_app_uk_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/bekemazotosemem.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4E 5088 bytes
SHA-256: 59803963eafca17c6811294a60167ea7c52324a5d5f0040a8f5ac8716dca899e

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