Malicious PDF — malware analysis report

Static analysis result for SHA-256 612b985dbc5d62a0…

MALICIOUS

PDF

77.2 KB Created: 2021-04-15 05:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 67f72f88aa08d126d6ecceb20c91eb90 SHA-1: dfb5545513b58b8f6329f60e1a44d755ce983e0b SHA-256: 612b985dbc5d62a0f3204f47bb81722e25b3b8b1ba24ab0780be722a165558c1
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URIs pointing to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a large number of links on disposable hosting, likely for SEO manipulation or to host phishing/malware content. The embedded URLs, particularly the one on 'jumiwimov.ru', are suspicious and likely serve as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jumiwimov.ru/strik?utm_term=search+google+images+by+exact+size PDF link annotation
    • http://zelumefepa.sportsontheweb.net/assassins_creed_forsaken_espaol_descargar.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/pusipezolenamanaminivav.pdfIn PDF document text
    • http://zuregazezoral.mygamesonline.org/16290628371.pdfIn PDF document text
    • http://zodezabazigojab.iblogger.org/dubimunokiwu.pdfIn PDF document text
    • http://fidofawi.medianewsonline.com/8084860030.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/82826580970.pdfIn PDF document text
    • http://zuxekagapefe.mygamesonline.org/work_performance_appraisal_journal.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/xabevodinuzobutoboreroke.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/painting_with_a_twist_bandera_rd_san_antonio_tx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c26a393-6979-4ccf-99f9-01fcb4430974/64010625297.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/pobudizededo.pdfIn PDF document text
    • http://nimetegukixiz.rf.gd/volleyball_score_sheet.pdfIn PDF document text
    • http://wijobofeforot.epizy.com/68076484509.pdfIn PDF document text
    • http://nopexodimu.epizy.com/timagibafibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4c625cb-d386-4470-8dd8-bfd036a61f21/79782201169.pdfIn PDF document text
    • http://nabafutig.myartsonline.com/beethoven_piano_sonata_1.pdfIn PDF document text
    • http://lalesokam.epizy.com/math_worksheets_for_kindergarten_numbers_1-20.pdfIn PDF document text
    • http://mugomodag.atwebpages.com/concepto_de_auditoria_de_estados_financieros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b7f81ff-c6ce-4889-ade3-affcc525a712/misugezifegupe.pdfIn PDF document text
    • http://dojiseb.epizy.com/rozopixivafovog.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE63 5676 bytes
SHA-256: 2b4cfa77c39143bd6587f251d51a625cbbb14df370949278fb5ada8c341ed8e4
font_01_sfnt_off0001019b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019B 11312 bytes
SHA-256: 158b28e1ec8fe7ef090ee3c5364e58ea0c2a783afa2fa1ff7b31d9628c65019a

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