Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8898e9d8f41752b…

MALICIOUS

PDF

74.7 KB Created: 2021-03-22 04:37:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 442bbf3eb556041ea52620e1119ed3ec SHA-1: c4943eb5adaa6d3bab59950026b53e00337aece3 SHA-256: b8898e9d8f41752bfaf87b0127a8ead00ec884fc234eee72f4acee56970fbc55
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 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://bologen.ru/wix?keyword=evil+within+the+assignment+achievement+guide PDF link annotation
    • https://nitavadokeja.weebly.com/uploads/1/3/1/1/131163909/678358577e85e.pdfIn PDF document text
    • https://zopixidasopotid.weebly.com/uploads/1/3/1/3/131397955/nukorelobivufifisib.pdfIn PDF document text
    • http://zigoramad.iblogger.org/material_design_font_cheatsheet.pdfIn PDF document text
    • https://cdn.sqhk.co/vekepafate/ggjaKvH/68924033083.pdfIn PDF document text
    • http://gedobitubojufu.iblogger.org/application_letter_block_format.pdfIn PDF document text
    • http://huaweistoreukr.xyz/john_proctor_quotes_about_his_namezaptv.pdfIn PDF document text
    • https://fekugutupufug.weebly.com/uploads/1/3/4/8/134876907/tudux.pdfIn PDF document text
    • https://cdn.sqhk.co/barugogip/gjiehj5/lajorimigabexipijanet.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/titulos_de_credito_definicion_doctrinal.pdfIn PDF document text
    • http://toolsbestpricemicrometer.site/lorubuwuberabadhip.pdfIn PDF document text
    • http://fisidijomufuto.22web.org/kuehne_nagel_international_ag_annual_report.pdfIn PDF document text
    • http://reestr.site/irrigation_engineering_terminologyhvuse.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/xomufuvutofov.pdfIn PDF document text
    • http://wufejupixixot.epizy.com/canon_pixma_mx432_paper_jam.pdfIn PDF document text
    • http://lukegijabezul.rf.gd/leguvitarosuminibopu.pdfIn PDF document text
    • http://nuwadolonopip.onlinewebshop.net/stephen_king_the_dark_tower_audiobook.pdfIn PDF document text
    • http://fuxazulofonu.epizy.com/kifefo.pdfIn PDF document text
    • http://fepujusarif.epizy.com/teoria_del_aprendizaje_social_bandura.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B5 3476 bytes
SHA-256: 436e31fc094f4df73ac100ff995541ca5f2efbff47d0f66f1ba67abc597a4e9d
font_01_sfnt_off0000e5fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FC 5368 bytes
SHA-256: c22164f6319b8d37aef7f1c4491d1ca93f591b6b0920b0f598a4ef56281b5b28
font_02_sfnt_off0000f830.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF830 10884 bytes
SHA-256: d201b039b9c369767657beeca1193608baedeb99db5e771704fb68969711f6e4