Malicious PDF — malware analysis report

Static analysis result for SHA-256 f739c15a7c3f0835…

MALICIOUS

PDF

110.0 KB Created: 2021-03-29 10:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 6969e9752688bae8c9bf0db7e4eb3d2a SHA-1: 1b387432efb7590e36d1f2a257b3ddf1e2b57015 SHA-256: f739c15a7c3f08356e1b6f8457e916bfff747af260fa004e6d3c308e54c62322
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs pointing to various domains, many of which are disposable, suggesting an attempt to obscure the ultimate destination or distribute content across multiple low-reputation hosts. The PDF's structure and the presence of external URIs indicate it's designed to redirect users, likely to phishing sites or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://jottigo.ru/wix?keyword=umm+kulthum+a+voice+like+egypt+summary PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405687/normal_5fd11d6340986.pdfIn PDF document text
    • http://tonemisi.medianewsonline.com/babcock_wilcox_boiler.pdfIn PDF document text
    • http://saripituxupagek.sportsontheweb.net/blockchain_technology_in_agriculture.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/nubazomakufokixoxetujof.pdfIn PDF document text
    • http://xomunuxeju.sportsontheweb.net/jilivetagokusafupenez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4527108/normal_602b807400f79.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467593/normal_5ff7e7ca15123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420760/normal_60600f6b82816.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472773/normal_5fc7a1c4b0ef0.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/11511065848.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403672/normal_6000bf6f51266.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464734/normal_5ffdd38faa6ff.pdfIn PDF document text
    • http://larumutul.getenjoyment.net/17606151507.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462696/normal_5ff5ab82c03fa.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/dan_browns_robert_langdon_books_chronological_order.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_605ee8e858fb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472763/normal_6056e85345987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388158/normal_5fd82aba93883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488317/normal_6026eb8a78956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gigavolaxo.epizy.com/pukukinaralomasofalipo.pdfIn PDF document text
    • http://jasixinupij.epizy.com/australian_visa_application_form_png.pdfIn PDF document text
    • http://gipebevu.atwebpages.com/how_to_overcome_early_childhood_trauma.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/riwasusogix.pdfIn PDF document text
    • http://rawigukegopafot.onlinewebshop.net/daxomuvulanemisa.pdfIn PDF document text
    • http://rozipiliwune.epizy.com/hidden_figures_trailer.pdfIn PDF document text
    • http://kagumabexa.rf.gd/how_to_connect_toshiba_ct-8069_smart_tv_to_internet.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00018804.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18804 20540 bytes
SHA-256: ce346dc38fe7b47b5156fc62a160c90b8d12b8f47ec8f74ae6da512c954749a1
font_00_sfnt_off00014a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A6B 5564 bytes
SHA-256: 3b6f733b5a23c61424f7cb1bb77c2c49f9fd9fa03122ce02d322f11751ea10ed
font_01_sfnt_off00015d3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D3E 14092 bytes
SHA-256: 9eeb69fd089e5b53b4ba5cf1ab307a0733c6af8baa2aa15f84110598fc5440c2