Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f4d0ad94e3b4f9…

MALICIOUS

PDF

72.8 KB Created: 2021-02-28 04:56:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: fd2168ea2ff9abcebd1d1d3cd4c59b75 SHA-1: 107ec975020606bf04cc7bb04550eee5ca1c15a1 SHA-256: d3f4d0ad94e3b4f9b28b283a8cd516089b02b506ed656443231eec79025dbee8
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains, suggesting a link farm or phishing operation. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights the use of disposable hosting for multiple PDFs, reinforcing the malicious nature of the document.

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://resalured.ru/award?keyword=built+2+last+homes+llc PDF link annotation
    • http://rumukisizupew.iblogger.org/2702069889.pdfIn PDF document text
    • https://kexinebig.weebly.com/uploads/1/3/4/3/134338338/rimidatipobep.pdfIn PDF document text
    • https://referozudu.weebly.com/uploads/1/3/0/7/130775612/dogabibiwefeko.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/jeCjaFl/53527195055.pdfIn PDF document text
    • http://lady-bug.club/91249450220miuir.pdfIn PDF document text
    • http://nemosixumeki.mypressonline.com/kujog.pdfIn PDF document text
    • http://becloud.website/persyaratan_sim_c_20190x39m.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/hhVX2if/41463837725.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/bhjihdt/73091482723.pdfIn PDF document text
    • http://nowukusox.mypressonline.com/all_clad_slow_cooker_lid_fit.pdfIn PDF document text
    • http://zabemaladameg.medianewsonline.com/67720576301.pdfIn PDF document text
    • https://cdn.sqhk.co/noxisoture/jgeKiih/tozowowadegogokelejudovis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tososite.onlinewebshop.net/fogazosu.pdfIn PDF document text
    • http://kijijaxozaro.epizy.com/zinedaxegojeri.pdfIn PDF document text
    • http://bumurulepowele.myartsonline.com/actores_de_la_pelicula_el_diario_de_greg.pdfIn PDF document text
    • http://ziwitiko.epizy.com/luxalutiguwarunibewedeku.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 5124 bytes
SHA-256: dc567e1c279420d866bb8121fea733eafa4c0d7cd35d80b8e922ce010c3a6f33
font_01_sfnt_off0000f24a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24A 10488 bytes
SHA-256: 3c395e439eeb8ed06a7031ff43d58b09362a0f68ee1e08fb597f8a54d9cbe1a4

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