Malicious PDF — malware analysis report

Static analysis result for SHA-256 33fbffa91b7d68ba…

MALICIOUS

PDF

76.5 KB Created: 2021-03-17 05:07:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 40eb1ad608759a2e2d43c4f34b781836 SHA-1: 904947e194fd975c2b5301ff2b4f8035372f7b4e SHA-256: 33fbffa91b7d68ba037760c5a2a2d6e996c709c3c6e4ac0f7360952236d5ab90
156 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 0.9998

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=is+your+brain+male+or+female+documentary PDF link annotation
    • https://cdn.sqhk.co/pixorikibam/idTOQij/zevubepuxipawesaboke.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzonoviza/gjhfjiY/voice_recorder_software_free_download_for_mac.pdfIn PDF document text
    • http://recepty-dd.info/how_to_write_egyptian_numbers1xrlu.pdfIn PDF document text
    • http://oneitstore.info/wutaxowejizuwhyqz7.pdfIn PDF document text
    • https://cdn.sqhk.co/rekutadis/c7hf1yQ/75442239634.pdfIn PDF document text
    • http://pokaguzuxobomez.iblogger.org/bluffmaster_2005_movie.pdfIn PDF document text
    • https://cdn.sqhk.co/gipirukanut/K5hgjfK/nextbike_app_price.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/waduzirader/wwe_games_for_android_phones_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/binorakojere.pdfIn PDF document text
    • http://pukokudew.epizy.com/koxuka.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/watermark_remover_apk_cracked.pdfIn PDF document text
    • https://s3.amazonaws.com/kavalukato/is_popcorn_ok_to_eat_on_candida_diet.pdfIn PDF document text
    • http://kakigonameta.epizy.com/alkynes_ncert.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/60795457618.pdfIn PDF document text
    • http://wedozepa.epizy.com/pdf_aristoteles_e_dante.pdfIn PDF document text
    • https://9c12218e-e157-4070-b33f-4467b3cb42bb.filesusr.com/ugd/0c60a0_fc5c97095db24d24a7588e69fb3c163c.pdf?index=trueIn PDF document text
    • http://xuwolerapole.epizy.com/what_defines_a_godly_woman.pdfIn PDF document text
    • https://f16fa5c1-8556-4bba-8f86-04d9c108beb0.filesusr.com/ugd/2c3d75_e9f7ad9698a64941b8367fcea2440576.pdf?index=trueIn 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_off0000ed2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2E 5348 bytes
SHA-256: 2055c047ce8c51f44dd65d1bdc4167cd481b156a5e9250e1c3d08113c1e13bb1
font_01_sfnt_off0000ff4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF4E 11124 bytes
SHA-256: d3ef68b88308c6d411f88b92824fd8553de8d2298dda69728625f25ee67376f4

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