Malicious PDF — malware analysis report

Static analysis result for SHA-256 54e75c7bcbe30ac0…

MALICIOUS

PDF

73.5 KB Created: 2021-04-11 13:25:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d5aa3ebe3e93522fd1ed74d5ca6c4aac SHA-1: c0712764fe25f80bc0833180bf5dfa7221fa99a4 SHA-256: 54e75c7bcbe30ac0b4f3502e56332f3f198d9f62cdadbcad29baa2d6cd067d4a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://mezovuduw.ru/strik?utm_term=how+to+program+a+directv+remote+to+your+box PDF link annotation
    • https://cdn.sqhk.co/fogobewataja/jahaUhc/86707075371.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/ldlgdjf/wanumubad.pdfIn PDF document text
    • http://gekodejevotug.medianewsonline.com/67529913319.pdfIn PDF document text
    • http://fisareboveda.getenjoyment.net/types_of_negative_emotions_list.pdfIn PDF document text
    • https://cdn.sqhk.co/fumodolanes/jejfrhd/galogo.pdfIn PDF document text
    • http://pebunoguge.mygamesonline.org/database_management_system_navathe.pdfIn PDF document text
    • http://tojuvapemupo.mywebcommunity.org/zemewija.pdfIn PDF document text
    • http://fajasated.mywebcommunity.org/sizanulolexu.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/aFuLiji/96160500185.pdfIn PDF document text
    • https://cdn.sqhk.co/ketixudolu/7hdZyjd/pos_easypay-_cards_btu.pdfIn PDF document text
    • https://cdn.sqhk.co/kamozipu/ihgha6z/mumowiled.pdfIn PDF document text
    • https://cdn.sqhk.co/xonipavu/gchaqjc/kalus.pdfIn PDF document text
    • http://jarevine.mywebcommunity.org/insert_file_in_excel_worksheet.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/kosipefojaw/nejufajagivezisog.pdfIn PDF document text
    • https://1dab3517-3db0-43ff-9fd6-b65b51f65b60.filesusr.com/ugd/565485_83c76d2c71f6466da81b398d755cfa4a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/zumavamofikas.pdfIn PDF document text
    • https://s3.amazonaws.com/nonabafat/jiwinabageroxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wutogugej/zitiwosivebalumosunagapi.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_29da1196fee040e5868ec26b01a34e84.pdf?index=trueIn PDF document text
    • https://4900ecec-7ac1-411c-be2c-b077674085c8.filesusr.com/ugd/493135_7b6f2d76ddd74c94b439271f323e0f95.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/nikon_p510_camera_for_sale.pdfIn PDF document text
    • https://81da36f4-dec6-4bf4-836b-19ed67500659.filesusr.com/ugd/5fd5c1_37a8979ad8964a40a3cc2fc2863d7410.pdf?index=trueIn PDF document text
    • https://2987c0f4-171e-4473-b3f1-a5468658115b.filesusr.com/ugd/75ff8a_40b42a6653644e0482aec610787e7d3d.pdf?index=trueIn PDF document text
    • http://tivakifuzir.atwebpages.com/47668216728.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_off0000e209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE209 5608 bytes
SHA-256: ac8326235a3a5262be3d0f74f3ee849752c66e87f01d43de16757b7aeed31f43
font_01_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 10136 bytes
SHA-256: b4a7440be297a49d7fdfaabf984ed6d3941a9c661c2f5738eb0dba61d781ab1f