Malicious PDF — malware analysis report

Static analysis result for SHA-256 0475994d1540f27d…

MALICIOUS

PDF

86.7 KB Created: 2021-04-09 05:40:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d20c7d804561264aa572e71e09814bdf SHA-1: d45939b3db9bcf4a697ae88b01d1053164103800 SHA-256: 0475994d1540f27dc488123422dcf3f4c4b17e80c2ca029155a9cdea445b1b2e
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=linkers+and+loaders+by+john+r.+levine PDF link annotation
    • http://rowowevu.mypressonline.com/4534446708.pdfIn PDF document text
    • http://reduslim-shop.site/80228265726n7gm4.pdfIn PDF document text
    • http://winoraama.website/92913364052jsk3i.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/95145141769.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/220_volt_ac_to_12_volt_dc_circuit_diagram.pdfIn PDF document text
    • http://prizinsta24.space/6701049340hz2cr.pdfIn PDF document text
    • http://dezlice.ru/61590133758s1us4.pdfIn PDF document text
    • http://unonatur.space/tijetutedemetomafufukojawbtgyx.pdfIn PDF document text
    • http://xurivikarode.iblogger.org/96571063236.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fibalikirikoti.epizy.com/duviwepafuzaravedorasumo.pdfIn PDF document text
    • http://bexexakik.myartsonline.com/caracteristicas_psicologicas_de_la_adolescencia.pdfIn PDF document text
    • http://seroroxunabolu.onlinewebshop.net/88008552651.pdfIn PDF document text
    • https://s3.amazonaws.com/xifabilejilab/percy_jackson_titans_curse_trailer.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/59976480108.pdfIn PDF document text
    • http://kuwulanunemitiv.epizy.com/certificate_of_origin_form_a.pdfIn PDF document text
    • http://lawiferow.myartsonline.com/alphabet_anglais_phontique.pdfIn PDF document text
    • http://dekidad.epizy.com/area_and_perimeter_of_semicircle_worksheets.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/73804331340.pdfIn PDF document text
    • http://gotuziput.epizy.com/xopupexetotafawuxus.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/tinabilisulodut.pdfIn PDF document text
    • https://s3.amazonaws.com/tuzakifezara/lipoguwel.pdfIn PDF document text
    • http://wuwedilejom.myartsonline.com/69755450191.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/review_rowenta_air_purifier.pdfIn PDF document text
    • http://femejuzi.epizy.com/37470564071.pdfIn PDF document text
    • http://zowuxepalaget.epizy.com/64933728956.pdfIn PDF document text
    • http://sawujasasit.epizy.com/cancer_de_mama_prevencion.pdfIn PDF document text
    • http://begukisar.epizy.com/jeanne_d_arc_psp_skill_guide.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_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 5328 bytes
SHA-256: fc71343ee6079fdfdb50df01c6b3263b6b2b3d392da77028314e72825870e735
font_01_sfnt_off0001262c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262C 11384 bytes
SHA-256: 12b1eea6d1711c9dbfbe8d6554a1bb5d0ea00b719f75040f8aaaec308975163a

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