Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1d690f580b3bdb…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 02:57:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 99b3b08c84983d2c174f7c2fac96d6b0 SHA-1: d04dae20a6949a723aded63258827c2e03d4ffca SHA-256: 1c1d690f580b3bdb005585dcaba54b807604cb84bf5e887cb30b74719d2590fe
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://dugedepap.ru/strik?utm_term=how+to+fix+aux+heat PDF link annotation
    • http://nubolutlion.xyz/bunizuwuxorieg1.pdfIn PDF document text
    • http://roflan.site/74071863937om4n0.pdfIn PDF document text
    • http://siduwukalupi.22web.org/definition_of_economics_by_robbins.pdfIn PDF document text
    • http://wiwajekirutiw.scienceontheweb.net/jeneki.pdfIn PDF document text
    • http://biolinkus.me/how_many_pages_are_in_the_it_novelftvn7.pdfIn PDF document text
    • https://cdn.sqhk.co/pumevigatare/axu8aHW/32346245244.pdfIn PDF document text
    • http://kovativegapok.getenjoyment.net/circuit_diagram_of_logic_gates.pdfIn PDF document text
    • http://qlemelest.online/3737270254669u63.pdfIn PDF document text
    • http://bapatavusirave.mygamesonline.org/jukegetalafop.pdfIn PDF document text
    • http://wijotit.iblogger.org/kewomemenowokoneru.pdfIn PDF document text
    • http://xitnet.fun/list_of_mathematical_constantspdpzs.pdfIn PDF document text
    • http://redtea.space/ibps_exam_syllabus_2019_download8nry2.pdfIn PDF document text
    • https://cdn.sqhk.co/jimikafede/5e6fjf1/joguf.pdfIn PDF document text
    • http://demask.space/honda_rebel_300zyyy9.pdfIn PDF document text
    • https://cdn.sqhk.co/kefaforuletu/ii10lkN/livre_pour_apprendre_anglais.pdfIn PDF document text
    • http://legalvictory.group/el_encantador_de_perros_libro_gratisyyzlk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_a45dc2364b4d448e8b32f25ba767b2b6.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_4fc6f8314859459697062e5f094a87f7.pdf?index=trueIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/33306951809.pdfIn PDF document text
    • http://vubepet.epizy.com/can_you_still_get_a_flip_phone_from_verizon.pdfIn PDF document text
    • http://luwatejanif.epizy.com/28263295016.pdfIn PDF document text
    • http://wegamaluperetuj.atwebpages.com/how_to_get_rid_of_a_rash_on_my_newborns_face.pdfIn PDF document text
    • http://bexiguxiluk.epizy.com/stainless_steel_splashback_sheets.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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 4444 bytes
SHA-256: e0304bb3e822e690c2024558066b2255ff6321fb8027fb6fe986c3d248e7384e
font_01_sfnt_off0000fe0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0D 11244 bytes
SHA-256: a463862643e2e4eaf946079ca5c8d952108c01660f56c51a0eaad9002432538f
font_02_sfnt_off00012439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12439 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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