Malicious PDF — malware analysis report

Static analysis result for SHA-256 398ebac9299cab99…

MALICIOUS

PDF

70.1 KB Created: 2021-02-25 23:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 384685f6238139333b9c12ea1f4c2baa SHA-1: c1e7855dc6116aaa22b5972f16f72a44825e29f1 SHA-256: 398ebac9299cab99752b96f6f44de2857edbd711a3718796bdc15eb00350acd5
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to compromised or malicious sites.

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://seumenha.ru/strik?utm_term=fone+yurbuds+jbl+liberty+wireless PDF link annotation
    • https://gaxasexafarud.weebly.com/uploads/1/3/4/5/134590452/zomisimujesiv.pdfIn PDF document text
    • https://nigukaxo.weebly.com/uploads/1/3/1/4/131453065/zarajigo_sujeduxu.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/numinutavoti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393506/normal_5ffad36a5b54a.pdfIn PDF document text
    • http://zugemenelil.medianewsonline.com/93144340459.pdfIn PDF document text
    • https://kofudisefases.weebly.com/uploads/1/3/4/0/134018526/4354568.pdfIn PDF document text
    • http://vipadobotisituz.mygamesonline.org/tofegoxelowim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fefee0a1ebd9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365626/normal_5fe95de6844b9.pdfIn PDF document text
    • http://pixuvuxojatob.iblogger.org/neziwakaneselosovev.pdfIn PDF document text
    • http://maretexojud.66ghz.com/37146139794.pdfIn PDF document text
    • http://barajofa.mywebcommunity.org/how_to_integrate_software.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/xatosukodabovuxegokiboxi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jedasuzafofirif.epizy.com/bauer_mariner_ii_compressor_manual.pdfIn PDF document text
    • http://bixuxopot.epizy.com/bsc_nursing_admission_form_2019_mp.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/element_4k_tv_remote_not_working.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_off0000d64f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64F 4976 bytes
SHA-256: a0408bde65b540e3815eb2def965643dd35a0413fb96399edffcc8fdadae0e57
font_01_sfnt_off0000e765.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE765 10464 bytes
SHA-256: e2610b66890bcd4dc96488aa0aa10b86f7fe28a6bd22eb9eccd304a71b34438d

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