Malicious PDF — malware analysis report

Static analysis result for SHA-256 4358a0c21b1b4f9d…

MALICIOUS

PDF

106.8 KB Created: 2021-03-15 07:14:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: e59e88d8d1c9aa9179de4f7312bbba94 SHA-1: b63559b52c90992487b5111e43c4998e2feee604 SHA-256: 4358a0c21b1b4f9d20138ab843f0992b75c7a63707e4dabe19f4070161f38040
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The embedded URL `https://pelibifir.ru/strik?utm_term=exterior+angles+of+a+polygon+worksheet+tes` is a primary indicator of the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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 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.
  • 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://pelibifir.ru/strik?utm_term=exterior+angles+of+a+polygon+worksheet+tes PDF link annotation
    • https://cdn.sqhk.co/tovozovuzedu/iehc9gp/6220314924.pdfIn PDF document text
    • https://cdn.sqhk.co/parikozug/jcrhe52/plain_city_ohio_restaurants.pdfIn PDF document text
    • https://vebuxevofarina.weebly.com/uploads/1/3/4/0/134013543/4921927.pdfIn PDF document text
    • https://takesefitetipal.weebly.com/uploads/1/3/2/6/132682925/xidezana_simiwedikejemur_kadikajukome.pdfIn PDF document text
    • https://nupanirofedodav.weebly.com/uploads/1/3/4/4/134470916/747115.pdfIn PDF document text
    • http://zidotuwad.22web.org/lodanilaraxavu.pdfIn PDF document text
    • https://wukelefitifaka.weebly.com/uploads/1/3/4/8/134882985/f3cb2168e9a968b.pdfIn PDF document text
    • https://fekodajitor.weebly.com/uploads/1/3/0/8/130874258/misugazozajeg_lilagidukajolo_toluzekidizupe.pdfIn PDF document text
    • https://cdn.sqhk.co/xiladuxe/gBKBMhH/42108129321.pdfIn PDF document text
    • https://jotafeke.weebly.com/uploads/1/3/4/0/134096025/2691388.pdfIn PDF document text
    • https://sirukume.weebly.com/uploads/1/3/0/8/130814715/6433776.pdfIn PDF document text
    • http://pugopumonerab.22web.org/vojis.pdfIn PDF document text
    • http://pububasolemi.22web.org/autodidacte_en_programmation_informatique.pdfIn PDF document text
    • https://cdn.sqhk.co/vizinifum/bggghHg/70425218982.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/7674727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bejutamukedus.epizy.com/saint_seiya_awakening_apk_ios.pdfIn PDF document text
    • http://nifojasavolu.rf.gd/zofubokabejejukobij.pdfIn PDF document text
    • http://borosiker.rf.gd/autocad_demo_mac.pdfIn PDF document text
    • http://sakelukaje.epizy.com/soguvidenukesafag.pdfIn PDF document text
    • http://buloderijapu.epizy.com/wewitusisato.pdfIn PDF document text
    • http://bigisewolax.epizy.com/kindle_books_online.pdfIn PDF document text
    • http://lulevewutowa.epizy.com/impeachment_of_andrew_johnson_worksheet.pdfIn PDF document text
    • http://bofutezexo.rf.gd/materia_y_energia.pdfIn PDF document text
    • http://redufowoloware.rf.gd/portugues_para_estrangeiros_intermediario.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C66 2828 bytes
SHA-256: a17885b4fd577e0298a64705d5055d2ac7c2363fd7008e9cf236b3df412a17d8
font_01_sfnt_off00016660.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16660 5448 bytes
SHA-256: 91c02730f16d38513b1414a73db2efc44ad4c8a6fc9c142ba83b7a88a4122418
font_02_sfnt_off0001790b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1790B 10348 bytes
SHA-256: ac0843f48f244c685935f10ee77bbeda37d3060b46a9c63d5a1a2f4f5ca8d7a8