Malicious PDF — malware analysis report

Static analysis result for SHA-256 85b6ea7044450e69…

MALICIOUS

PDF

70.8 KB Created: 2021-02-22 02:00:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0e2e5fbd3dd4fcc353002e8111350d08 SHA-1: bbac726aaf7ee3021a327f1ebd3870dea22f99ce SHA-256: 85b6ea7044450e69d3446b26e27554bd8b4defe79058da9085e999434ba1e9f2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, forming a link farm designed to redirect users to malicious websites. One of the primary links points to a known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=how+do+i+find+latitude+and+longitude+on+google+earth In PDF document text
    • https://wupumemugate.weebly.com/uploads/1/3/1/4/131407036/8607160.pdfIn PDF document text
    • https://kobalogowitat.weebly.com/uploads/1/3/0/7/130776452/tepes.pdfIn PDF document text
    • https://rizafosukozesal.weebly.com/uploads/1/3/5/3/135346652/3670699.pdfIn PDF document text
    • http://begdas.space/what_is_the_best_sandwich_at_firehouse_subsvjw76.pdfIn PDF document text
    • http://atlas-copco.su/dbs_application_forml3oiv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402737/normal_60270b5bd628d.pdfIn PDF document text
    • https://sajosapisede.weebly.com/uploads/1/3/4/3/134344890/kuvut-kowunosinidax-bebutototobefe-ximogugiwoviba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465691/normal_5fe76f607fe5c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474231/normal_5fef39d124b18.pdfIn PDF document text
    • http://kalavar.xyz/42954750516op8s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489730/normal_5feedcd820e02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412388/normal_601bc35f91b82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496811/normal_5ff9194195cec.pdfIn PDF document text
    • http://hookup154.space/verb_forms_list_with_gujarati_meaning_free_downloadrqsgt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470385/normal_600551da4be74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470400/normal_5ff00041e2ade.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/mojivikapeti/gangavaram_port_limited_annual_report.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_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 5044 bytes
SHA-256: 3090c205c88008e99ed5dcc980fd564664524a8fade050ae3fbd623da2c29d21
font_01_sfnt_off0000eaf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAF3 10080 bytes
SHA-256: 9da3334def57e15bc74fff22af4f255e389d846a3362ba93e3b2ea2b826fa65b

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