Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ceebe60e9023ab…

MALICIOUS

PDF

67.9 KB Created: 2021-02-15 15:26:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: d6cd35d3008990c72d16b31218a0f0ef SHA-1: a28b9294fd4c0c248f51d83a84c7a4c7c8f941d6 SHA-256: 39ceebe60e9023aba74120cededdd3c8ce8744429cc9cbafe5ecf96fa0e59fd0
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. One of the embedded URLs, 'https://bologen.ru/strik?utm_term=their+eyes+were+watching+god+chapter+13+audio', is likely part of this scheme. No scripts were extracted, but the PDF structure and link farm heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/strik?utm_term=their+eyes+were+watching+god+chapter+13+audio PDF link annotation
    • https://lepefolavexar.weebly.com/uploads/1/3/0/8/130874674/tidepajezuxokagif.pdfIn PDF document text
    • https://cdn.sqhk.co/keviwebewuta/el6jeC8/48494195789.pdfIn PDF document text
    • https://povilaromegew.weebly.com/uploads/1/3/4/4/134486615/rapised.pdfIn PDF document text
    • https://cdn.sqhk.co/lijedubejop/ghh3idE/jetpack_hero_miami_crime_mod_apk_unlimited_money.pdfIn PDF document text
    • https://putofikanavo.weebly.com/uploads/1/3/0/7/130738484/8889452.pdfIn PDF document text
    • https://subafoxa.weebly.com/uploads/1/3/1/3/131379179/zilikalutosake-larogam.pdfIn PDF document text
    • https://dudulisatosix.weebly.com/uploads/1/3/1/6/131637211/8d62d4a8deea9.pdfIn PDF document text
    • https://beperupofifu.weebly.com/uploads/1/3/1/6/131636755/konilejo.pdfIn PDF document text
    • https://cdn.sqhk.co/fewibefanid/PCii5hc/interstellar_trailer_1080p.pdfIn PDF document text
    • https://kegegofelev.weebly.com/uploads/1/3/2/6/132681159/c08312.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/hgux4wO/tuxarosudof.pdfIn PDF document text
    • https://pazerutafu.weebly.com/uploads/1/3/5/3/135392620/5658975.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/gIvpojh/rugawinunisof.pdfIn PDF document text
    • https://cdn.sqhk.co/nafadurip/jawdyXI/kopiniwijapalati.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/xetasif/35747673179.pdfIn PDF document text
    • https://s3.amazonaws.com/bubeto/assault_android_cactus_xbox.pdfIn PDF document text
    • https://s3.amazonaws.com/makumapikeze/rujaki.pdfIn PDF document text
    • https://s3.amazonaws.com/zozofufulolig/blackstar_fly_3_bluetooth_manual.pdfIn PDF document text
    • http://nelsonica.pbworks.com/w/page/25869035/Their%20Eyes%20Were%20Watching%20God%3A%20AudioIn 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_off0000ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA3F 5664 bytes
SHA-256: 5a4f21e85a987b7380d30df4c31d60d10aadfa6bf6cd1cdd3f2629a7213ca49f
font_01_sfnt_off0000dda5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA5 10968 bytes
SHA-256: 1c1e4071a591722712e1d7d2233f17e87ead8a6eaad9f4d630924630e9a3590e

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