Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4905e84f3e8ee34…

MALICIOUS

PDF

67.3 KB Created: 2021-03-06 11:11:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: bcb2c3d3f176a46d6c0667852600c08b SHA-1: 234bb58348c898b6ecce05d104b044ead76d5243 SHA-256: b4905e84f3e8ee34b489a180e62dd90d56d3d68e4a0b55e5809ad0b4023bbf78
156 Risk Score

Malware Insights

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

The sample is identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to PDF files hosted on various domains, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs indicate an attempt to redirect the user to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://vilenefex.ru/123?utm_term=panasonic+bread+maker+sd-yd250 PDF link annotation
    • https://revotilam.weebly.com/uploads/1/3/4/7/134732497/5ce1da9a618b.pdfIn PDF document text
    • http://gujufifirisin.22web.org/analytics_dashboard_template_excel.pdfIn PDF document text
    • https://rudofodirofebas.weebly.com/uploads/1/3/0/7/130739781/mogenileraf-silodewojerug.pdfIn PDF document text
    • http://likelid.xyz/maplestory_m_night_walker_skill_build_guide1kvnf.pdfIn PDF document text
    • http://instapodarok365.site/what_does_it_mean_if_your_sun_moon_and_rising_sign_are_the_sametacbw.pdfIn PDF document text
    • https://rifivubego.weebly.com/uploads/1/3/1/4/131407021/3882870.pdfIn PDF document text
    • https://kixixowagixu.weebly.com/uploads/1/3/2/7/132710794/pejanuxeretejak.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/punedulewu-korajasawapusa-saselipej-laroxurisaba.pdfIn PDF document text
    • http://2gusevshop.space/carmageddon_traffic_meaning7u84p.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/fukepez/93816822083.pdfIn PDF document text
    • http://guvenup.epizy.com/how_to_deal_with_stress_worksheets.pdfIn PDF document text
    • http://fazafof.rf.gd/wolizada.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/27610139730.pdfIn PDF document text
    • https://s3.amazonaws.com/lixasifasi/jimiwiwumozal.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/27892628879.pdfIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/wixemunidibadixabuwoz.pdfIn PDF document text
    • https://s3.amazonaws.com/risisipajole/pazela.pdfIn PDF document text
    • http://gawowupakifofe.rf.gd/zuxuxowu.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/62691821877.pdfIn PDF document text
    • http://ralupuwegilad.rf.gd/70630187089.pdfIn PDF document text
    • https://s3.amazonaws.com/fuvidokibet/47317768497.pdfIn PDF document text
    • https://s3.amazonaws.com/livivuvuwugeb/autobahn_polizei_simulator_2_apk.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_off0000cade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCADE 5788 bytes
SHA-256: 0d1f1cd8c856a4ada1d715e80676d27bdd3fe3e3efbd988c6f790c3410c19cea
font_01_sfnt_off0000de8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8F 9652 bytes
SHA-256: 198f6fc8bf8073b7b13070ba4d4b05660e3a88d17f961282d4c09cee21fa2df0

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