Malicious PDF — malware analysis report

Static analysis result for SHA-256 86198f2e4829eba0…

MALICIOUS

PDF

97.1 KB Created: 2021-03-12 16:17:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8d2ceb3b3411262443b67622ef239d37 SHA-1: f32696eadcabc0a53706047dccdfd4473cdde888 SHA-256: 86198f2e4829eba023632415c3782e347f324e1a331acfecd3dbc58d8d30c1bf
126 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://maypoin.ru/award?keyword=arquitectura+bioclimatica+pdf PDF link annotation
    • http://kumululurug.scienceontheweb.net/vimofimaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423460/normal_603112062839f.pdfIn PDF document text
    • http://rijebipimaba.getenjoyment.net/online_book_finder.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454172/normal_5fcfb56528605.pdfIn PDF document text
    • http://ruvinowuge.scienceontheweb.net/xebivupuxapapufepotademir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393639/normal_6045ff111e7c2.pdfIn PDF document text
    • http://totipuzuforaz.mywebcommunity.org/zovota.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476751/normal_603415e2c7d33.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/nanuze.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421780/normal_6009ab35e91fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xasagode.myartsonline.com/kikosezikavatonurufira.pdfIn PDF document text
    • http://kagabefusexem.epizy.com/reforming_of_naphtha.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16b0a443-d24d-4c3e-9191-8e483a47f51c/diaper_genie_elite_refills.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/varicose_veins_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f62a73-f2c7-4f19-8bd5-49b96c74f657/dark_souls_2_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/008bb21c-2bd5-422f-a16e-89f71c6bbaa8/lista_tascon_excel.pdfIn PDF document text
    • http://zumepif.rf.gd/babukifizakal.pdfIn PDF document text
    • http://zuxujofuteme.rf.gd/1882579155.pdfIn PDF document text
    • http://vejimugar.epizy.com/attach_file_in_mail_in_c.pdfIn PDF document text
    • http://labukifured.epizy.com/snakes_and_ladders_template_free.pdfIn PDF document text
    • http://bogalibamadom.myartsonline.com/what_is_the_impact_of_globalisation_on_indian_economy.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_off00014123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14123 5380 bytes
SHA-256: 75d9cc9f9c76a951d07f2921d9e5e2fa5e9905d25202db6ed7bad09e388179f6
font_01_sfnt_off00015351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15351 10612 bytes
SHA-256: 34227183a46503fb0b2ade999e4670ad423c41ed9b5c4e44a5fea3df9e45aba7

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