Malicious PDF — malware analysis report

Static analysis result for SHA-256 b134ad97b7b91285…

MALICIOUS

PDF

112.9 KB Created: 2021-03-25 20:46:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 3c172a25349efd1f25401ccd28b1ef9f SHA-1: 6afb958a8bc8f70a3b5ca74c32b4f4c1656717e7 SHA-256: b134ad97b7b91285944f5e429df1a00d1e26c99871247bd31eec7bbbf1674bbe
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 0.9990

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://baarspo.ru/strik?utm_term=cosmos+neil+degrasse+tyson+capitulo+12 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414357/normal_60183d53e9c42.pdfIn PDF document text
    • https://wumupokurura.weebly.com/uploads/1/3/0/7/130776197/5643519.pdfIn PDF document text
    • https://cdn.sqhk.co/nitunoda/Mhhq9jj/sijezuvuzaromutitoreb.pdfIn PDF document text
    • https://mubuxepuvu.weebly.com/uploads/1/3/1/3/131383429/vulubowow.pdfIn PDF document text
    • https://kagozekexep.weebly.com/uploads/1/3/5/9/135956698/a4d4b1e0ac1489.pdfIn PDF document text
    • https://jabexigiji.weebly.com/uploads/1/3/2/6/132695602/6142607.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366993/normal_5fce9dbf4beb6.pdfIn PDF document text
    • http://fartook.online/what_are_the_tools_of_e_learning3uvky.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489734/normal_6017a537ef7f8.pdfIn PDF document text
    • https://fejejupusojovif.weebly.com/uploads/1/3/1/4/131483068/suwekamada-veriw-xemido.pdfIn PDF document text
    • https://cdn.sqhk.co/lijuwezasip/hjhicf1/ai_projects_in_python_with_source_code.pdfIn PDF document text
    • https://cdn.sqhk.co/rizikodeni/haEdjj5/t_sql_format_currency_with_comma.pdfIn PDF document text
    • https://cdn.sqhk.co/foxoxaze/hMhAi2a/masterchef_turkiye_yeni_fragman.pdfIn PDF document text
    • http://viewcreditscore.info/brookstone_big_blue_power_speaker_manualb16h6.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/1873232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500189/normal_605a1fee6d721.pdfIn PDF document text
    • http://english-10.site/monsters_vs_aliens_2009_full_movie_watch_online72s5f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402960/normal_5ffb6f3d365b0.pdfIn PDF document text
    • https://cdn.sqhk.co/gixotagokezu/Ghehdjc/wenozof.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/8512722.pdfIn PDF document text
    • https://zirivuso.weebly.com/uploads/1/3/1/1/131164479/4d46118.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496225/normal_5fcacb6c8514c.pdfIn PDF document text
    • http://boothattendant.com/twitter_sports_pickso8r4n.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471513/normal_601f9bdf488c3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00017949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17949 5584 bytes
SHA-256: f835a90e5219582aeab09594292f84b590dbe7d8c4385307518d64756c46a2a8
font_01_sfnt_off00018c3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C3C 12488 bytes
SHA-256: e14ee80d27bf385feb7ae9b078bab048065d05afb33415f0d4ce6b9cdfe84a6d