Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad27393db2dc0613…

MALICIOUS

PDF

81.5 KB Created: 2021-03-16 07:05:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8ebfc54142eb02a9ee0649c90024ecff SHA-1: f6d256849882b12d8bd1b935e69673c5f06005ad SHA-256: ad27393db2dc0613d78c1aa24f7568d8e0c26fe6afeeed470a8889de7f52bf45
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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://kuzutuzo.ru/strik?utm_term=barron%2527s+math+2+pdf PDF link annotation
    • http://cupe1.ru/xevoku3ol5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375698/normal_5fe5fdc327d2e.pdfIn PDF document text
    • https://senovaxevuka.weebly.com/uploads/1/3/5/3/135304629/nobofuwovex.pdfIn PDF document text
    • http://giocodigital.fun/tokesojijukixbn52y.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379605/normal_5fe229af7414a.pdfIn PDF document text
    • http://topcreditreport.info/37889104101ityyr.pdfIn PDF document text
    • https://wuguruxozoza.weebly.com/uploads/1/3/4/0/134040539/5cde40a0.pdfIn PDF document text
    • http://finansi-7.online/5293540863759wxu.pdfIn PDF document text
    • http://giwewigipebi.medianewsonline.com/functionalism_theory.pdfIn PDF document text
    • http://mastericy-chistoty.ru/31948027324o24w6.pdfIn PDF document text
    • http://tejowigasinafu.getenjoyment.net/15802878096.pdfIn PDF document text
    • http://zomolejefej.mywebcommunity.org/gozuxo.pdfIn PDF document text
    • https://kimiligemapi.weebly.com/uploads/1/3/4/3/134343210/8873419.pdfIn PDF document text
    • http://oneitstore.info/354441042702rzw3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454559/normal_600e302e01ac1.pdfIn PDF document text
    • http://meetdouche.xyz/wazapogurco0.pdfIn PDF document text
    • https://fofapisobav.weebly.com/uploads/1/3/4/7/134712410/4901489.pdfIn PDF document text
    • http://regsenatvumen.website/brother_printer_hl-2140_instruction_manualjjmch.pdfIn PDF document text
    • http://unlockdeals.shop/ate_quando_entregar_o_imposto_de_renda_202049zx9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pedirite.onlinewebshop.net/test_de_inteligencias_multiples_para_adultos.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_off0000ffe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE9 5464 bytes
SHA-256: 3f36a31b66c91883860e7e7c9fc6a60ba8202c7e0a60a9c1301f12ad0bd26867
font_01_sfnt_off00011261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11261 11300 bytes
SHA-256: 11f6c0183f30d64bddffb25b946d2c08d62bbd8ff9c990d3d2e1078aa3d6da11

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