Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0946aea3b2e771e…

MALICIOUS

PDF

77.4 KB Created: 2021-03-27 18:20:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 6a4e54cdc27c157ed4c5138e75df4960 SHA-1: 5a79c07777910627c2c45981d0c4042bd788bc3c SHA-256: c0946aea3b2e771ed2f68884ab8748e90abe8ad2d355d2101edb7568256d6313
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malware. 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 numerous URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://jottigo.ru/award?keyword=draft+watermark+adobe+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4424376/normal_600ae5aca5359.pdfIn PDF document text
    • http://findssldz.xyz/jovetekewurokunijepigutac4.pdfIn PDF document text
    • http://mebets.xyz/albert_einstein_atomic_theory_contribution_dateadlxm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501046/normal_6040b7f4929fc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481999/normal_5fc7d6325c942.pdfIn PDF document text
    • http://taxiditugivubed.iblogger.org/soriperifukip.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427528/normal_6030022028d47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366646/normal_60245be7f13d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fe2db87702d3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473062/normal_5ff2061595522.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_6031d6257efe4.pdfIn PDF document text
    • http://dvertsoff.ru/2008_jeep_wrangler_unlimited_x_hard_top_removal645a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369164/normal_5fc923aaf1abb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_60327a3fdf3aa.pdfIn PDF document text
    • http://libralab.digital/loxakidisadazixujkeh3g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450864/normal_603c80d226090.pdfIn PDF document text
    • http://1gusevshop.space/39531690415rai7u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2c8134a4-d865-4da1-8961-c755d7242105.filesusr.com/ugd/6dcf04_f30b2f6a8f4f4571a9db52298b4c3c93.pdf?index=trueIn PDF document text
    • http://tanasebebibe.epizy.com/steins_gate_episode_6_summary.pdfIn PDF document text
    • http://kojevas.epizy.com/bawajopiwalijid.pdfIn PDF document text
    • https://435a888a-8f80-410d-aa77-77edd6e4491d.filesusr.com/ugd/51fec0_4457c9a6991a4d229de31336a2ca994a.pdf?index=trueIn PDF document text
    • http://vomifavub.epizy.com/toperule.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_30027b8490634a429ded2f72ba13fe0a.pdf?index=trueIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_045fb62fd51d4953ab54c44bd21a8ea1.pdf?index=trueIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_fe550a811739455ba322e2927332e529.pdf?index=trueIn PDF document text
    • http://lufasojaweg.epizy.com/1247423693.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_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 5272 bytes
SHA-256: 9dbe05e43e14b4bd5022ece66712dd981e6babbeb2e7a657dfa74850edba7c3b
font_01_sfnt_off00010282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10282 11188 bytes
SHA-256: 9877d7088fc493dea5034176ea236d6234f1f739e3a2e5f104ec1fbd2ea51991