Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c10e50691c3bd06…

MALICIOUS

PDF

69.7 KB Created: 2021-03-09 22:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 244d1d0df7cdeded2c6ffa07eeace748 SHA-1: 1d3c3531e624a47a934118105e71ef33a9de07e1 SHA-256: 1c10e50691c3bd06c80a8fa3c81d786db7373061a428a14837712db62d28bf60
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs, many pointing to disposable domains, suggests a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and URI findings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://zajinet.ru/award?keyword=catalogo+boxito+2020+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4460677/normal_602429b1b2652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_5fd1347feb3f1.pdfIn PDF document text
    • http://zegererevez.medianewsonline.com/25655036508.pdfIn PDF document text
    • http://javoreruja.iblogger.org/ladegigopejukemi.pdfIn PDF document text
    • http://drovazvenigorod.ru/moultrie_xv_6000_reviewspr0cm.pdfIn PDF document text
    • http://ndfnasg.xyz/wadomarapakajagedeguwfnkb.pdfIn PDF document text
    • http://indonesia2health.online/21636124222uwkjh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478127/normal_6042e6cc8ec33.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489033/normal_602cf2ca630a6.pdfIn PDF document text
    • http://kufejat.sportsontheweb.net/91871700128.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_601c6aabaec89.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405899/normal_5ff8dbceb90b2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487918/normal_6006e3e65e13b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xekoxekezefewov.rf.gd/gebiwoxofidixajelojatu.pdfIn PDF document text
    • http://sasuwirakib.rf.gd/jukenulelepomat.pdfIn PDF document text
    • http://rimatos.epizy.com/27585647608.pdfIn PDF document text
    • https://8c1dc56a-a131-4b43-acff-3635b9115217.filesusr.com/ugd/90423f_a523a1a262ac4243b8515f30cd9ac518.pdf?index=trueIn PDF document text
    • http://rulenanevatetid.epizy.com/97793268696.pdfIn PDF document text
    • http://rexefobixavater.myartsonline.com/jorujepusowufaguxaw.pdfIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_043e48b5bd9a4e1ca8ef40e46eacd383.pdf?index=trueIn 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_off0000d629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD629 5320 bytes
SHA-256: 0911ca492b61018e79815f5a45e8dcb633f44140ca61bc53e76cf78777be6a79
font_01_sfnt_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 9696 bytes
SHA-256: 3445bab49a92f860533a9643901037e96581dcdad8404aa4b69b74f353b46670

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