Malicious PDF — malware analysis report

Static analysis result for SHA-256 40858c0d3e57cfe7…

MALICIOUS

PDF

76.2 KB Created: 2021-03-30 16:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82dfe3706c60dd312c25ee908bcc5acf SHA-1: 94c63cba9bf2dd9078e19a0889a137094c5317fe SHA-256: 40858c0d3e57cfe7821b1e9055162a476f0a1303c9c347206510b9aa065cbc28
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 0.9995

Heuristics 6

  • 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
  • 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://maypoin.ru/strik?utm_term=walmart+pharmacy+open+christmas+eve PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402252/normal_60238198218a5.pdfIn PDF document text
    • https://jupagefux.weebly.com/uploads/1/3/1/3/131398252/dojogibikom.pdfIn PDF document text
    • https://bunemanedadon.weebly.com/uploads/1/3/4/4/134476229/4908c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418368/normal_60436f79cb324.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/779f709cfb03.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/4a442.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383137/normal_5fe0be16786c6.pdfIn PDF document text
    • https://woxoxuwavi.weebly.com/uploads/1/3/4/6/134689382/8a054326f29.pdfIn PDF document text
    • https://zenunokiguwa.weebly.com/uploads/1/3/4/6/134614978/3012dea32500.pdfIn PDF document text
    • https://golagunowij.weebly.com/uploads/1/3/2/6/132695575/wobaminokudejil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_603f2f58d1dde.pdfIn PDF document text
    • https://xexidizufom.weebly.com/uploads/1/3/4/5/134508107/tuzubit.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/vizegemawokaxe/example_of_platoon_opord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e998ac0-4861-4244-9505-90e7e8d613ad/is_there_going_to_be_a_warrior_cat_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/naija_afro_beat_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea1a26c2-a417-4c0e-9bf5-e17ecadbeb4f/what_color_is_your_parachute_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17748c6f-9ff5-4fb2-ac8e-41bbc361f24d/eiu_worldwide_cost_of_living_index_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/doxifuba/how_to_create_an_algorithm_to_win_the_lottery.pdfIn PDF document text
    • https://c06d174a-caca-4ab2-b5a0-4525cd3135d4.filesusr.com/ugd/856cea_3d6dcc1b89af488782e4eb944f0d19cc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/88377269554.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0ada8e6a-a47d-4b2c-acd2-cded5cd49ef5/are_taylor_kitchen_scales_accurate.pdfIn PDF document text
    • https://de26864d-dd79-4a6d-8467-b5cf435a6969.filesusr.com/ugd/6ff07c_6f2c7f4782bd4db895801d95e7532076.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_off0000e941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE941 5348 bytes
SHA-256: 3463a2be237c604f9ba04fe20bf907ce31bfb793ed1160fd1b6b5a9eb514349c
font_01_sfnt_off0000fb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5B 11132 bytes
SHA-256: f96251ac0c68ceff312e8974d91fe15e3ade8fe5113d77772669ac702903b67c