Malicious PDF — malware analysis report

Static analysis result for SHA-256 f123dad14e7a870c…

MALICIOUS

PDF

86.6 KB Created: 2021-03-11 07:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 81604c339f93543ce360e3c820db8bd6 SHA-1: 44bd014102c473bf1ed65071e80fa53c916a8526 SHA-256: f123dad14e7a870c5151201ed5b0a0873f853d9267e446a07221370b39ac03cb
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to drive traffic. The embedded URL `https://kuzutuzo.ru/wix?keyword=zombie+age+3+mod+apk+revdl` indicates a lure for potentially unwanted software. While no scripts were directly extracted, the PDF structure and heuristics strongly suggest malicious intent related to SEO manipulation and potentially distributing unwanted applications.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kuzutuzo.ru/wix?keyword=zombie+age+3+mod+apk+revdl PDF link annotation
    • https://cdn.sqhk.co/lilaxikixo/Cib9yZW/321_drop_it_song_10_hours.pdfIn PDF document text
    • http://suxoxaxowigab.scienceontheweb.net/panokezamipaj.pdfIn PDF document text
    • https://cdn.sqhk.co/noxibogalu/gheeC1M/kesizabogagero.pdfIn PDF document text
    • http://wogivodugakovek.mygamesonline.org/16636993691.pdfIn PDF document text
    • http://falujojul.22web.org/marketing_management_philip_kotler_and_kevin_lane_keller_15th_edition.pdfIn PDF document text
    • https://cdn.sqhk.co/govulasem/yibIzib/lodudiselogul.pdfIn PDF document text
    • https://cdn.sqhk.co/moxinivo/4heEFhc/safeguarding_chronology_template.pdfIn PDF document text
    • http://gajaxujifusokul.mygamesonline.org/dungeons_and_dragons_starter_set_book.pdfIn PDF document text
    • http://vuxokiwi.22web.org/furenezoxekapega.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/hfc0vgj/class_9_maths_ncert_solutions_chapter_6._1.pdfIn PDF document text
    • http://tinesemexogo.mygamesonline.org/68202914250.pdfIn PDF document text
    • https://cdn.sqhk.co/kusasuzona/daghtnu/ice_princess_bubble_shooter.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/canon_av-1_film.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/gjgd1hf/65190534372.pdfIn PDF document text
    • https://cdn.sqhk.co/jefapukawore/iiSrAX2/jejironagirirugevi.pdfIn PDF document text
    • https://cdn.sqhk.co/mofosalamo/dgegj7s/natudetizidelixefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mudubotumiti.epizy.com/kaplan_ged_test_prep_2019_book.pdfIn PDF document text
    • https://181f3bdf-810f-4c34-abb3-9f3362228cd6.filesusr.com/ugd/30415f_717a3d2dcb8e4e1aaae25800fea420e3.pdf?index=trueIn PDF document text
    • https://00407fa8-a9ef-4b78-9bbe-46147fc8acf6.filesusr.com/ugd/5ecadc_0d17b269d11840908205efb2d1ed934a.pdf?index=trueIn PDF document text
    • https://4dcfe184-cd6c-48f8-9f23-5461c743a1d4.filesusr.com/ugd/cc8533_2157d703112f4a6ca25c87720be5f1fa.pdf?index=trueIn PDF document text
    • http://fedonefekipide.myartsonline.com/sort_a_spreadsheet_in_google_docs.pdfIn PDF document text
    • http://neveket.epizy.com/does_alexa_echo_speak_spanish.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_2a4a6f76d97e43d9be30d1e3051eb056.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E6 5484 bytes
SHA-256: b14c38656d4766f7a630051341a1ed981f34fa98c745ed09ca13ae9ceb784d70
font_01_sfnt_off00010a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A7D 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0001130b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1130B 10520 bytes
SHA-256: 8d511758f1f9d393d7630b7a91408ae1d89aa941a06b8cb6357930edc3c3701d
font_03_sfnt_off00013754.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13754 16092 bytes
SHA-256: 9af6fc3bf9d751f70540aea0fa47faa159a3604992cda23d2adcda3ffc5346b2