Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52fb6fae58d8842…

MALICIOUS

PDF

72.5 KB Created: 2021-05-11 08:25:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 123000da627f74b304b576c32fa86302 SHA-1: 6cdec5bdb4757011ac4e123cdce7e9beb2608709 SHA-256: a52fb6fae58d8842abfb604756d44043fc3db965c53a1ee7e6ab1006f2f5a645
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URL 'https://resalured.ru/strik?utm_term=microsoft+excel+for+data+analysis' further supports a lure-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=microsoft+excel+for+data+analysis PDF link annotation
    • http://mixutadumekaje.mypressonline.com/57859447958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443371/normal_603188943b8f6.pdfIn PDF document text
    • https://tumonejaw.weebly.com/uploads/1/3/6/0/136086042/gojoboxurokuzepos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470016/normal_6027a287d1add.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414680/normal_6051408734583.pdfIn PDF document text
    • http://vogudikomi.getenjoyment.net/atividades_educao_infantil_5_anos_para_imprimir_em.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459180/normal_6006c5b012329.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/tezinunojixodo.pdfIn PDF document text
    • http://kevifiregerufug.scienceontheweb.net/58355186223.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390068/normal_5fd64d9210a7c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481411/normal_5fefb575acaec.pdfIn PDF document text
    • https://xizimojagetotom.weebly.com/uploads/1/3/3/9/133997363/2457148.pdfIn PDF document text
    • https://zuseluxutiv.weebly.com/uploads/1/3/4/6/134686448/narikud_vadimuzileke_kipinaguli_dogugireto.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471686/normal_60072e708686d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374366/normal_604d746a08ea5.pdfIn PDF document text
    • https://litizabege.weebly.com/uploads/1/3/4/7/134713043/680e1caf.pdfIn PDF document text
    • https://majizozu.weebly.com/uploads/1/3/4/5/134598595/revevox_sodevadodoxavu_nivokizimepow.pdfIn PDF document text
    • https://bujajegufo.weebly.com/uploads/1/3/4/1/134108800/4189056.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vowefaxi.epizy.com/principles_of_semiconductor_devices_dimitrijev.pdfIn PDF document text
    • http://menimilerawapo.rf.gd/skyrim_block_slow_time_bug.pdfIn PDF document text
    • http://mukadepokexow.epizy.com/axa_ppp_healthcare_cancellation_claim_form.pdfIn PDF document text
    • http://bidanata.rf.gd/semiximepubatokipigipi.pdfIn PDF document text
    • http://jonesojawu.myartsonline.com/jogijipowexi.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_off0000df36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF36 5188 bytes
SHA-256: aaa0ba8c477dffa5c05a7855dac91a048af5dc7f4cb2a124c0a556c79946a49f
font_01_sfnt_off0000f102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF102 10644 bytes
SHA-256: c03bb85ca4d3bf7b5a0726431b18c3fb9fd3de65df5af6b80b23abe1afdea7b1