Malicious PDF — malware analysis report

Static analysis result for SHA-256 147584aa874515aa…

MALICIOUS

PDF

82.1 KB Created: 2021-04-09 19:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: db91c7c37fb406030f39acb6f5848990 SHA-1: 529360aacf84c7c5ebb6a4d7cdcf83e58823332b SHA-256: 147584aa874515aad4431d6855300ccabd64428636d1cb17aecd0342c013b25e
186 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+high+does+a+model+rocket+go PDF link annotation
    • http://nitiwomifigurod.mygamesonline.org/cardiorespiratory_physiotherapy_adults_and_paediatrics_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484639/normal_5fd1ace88f7d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491414/normal_5fde6edb7fcfc.pdfIn PDF document text
    • http://warixedivukinat.mygamesonline.org/buenos_habitos_alimenticios_en_nios.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464732/normal_5fe141efd33f9.pdfIn PDF document text
    • https://zumegopepotiko.weebly.com/uploads/1/3/1/3/131398003/6231037.pdfIn PDF document text
    • http://damizav.iblogger.org/79410089619.pdfIn PDF document text
    • http://nosaraxes.22web.org/happy_wedding_anniversary_tamil_song.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486535/normal_6041646ebea94.pdfIn PDF document text
    • https://puwawegolawibot.weebly.com/uploads/1/3/2/6/132682739/vufogobutulibif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383586/normal_602f989874bd8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489717/normal_601e1f3499c48.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/printable_feelings_faces_cards.pdfIn PDF document text
    • http://moradudipomibo.mypressonline.com/digestion_de_las_proteinas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490950/normal_6064e9f1531e0.pdfIn PDF document text
    • https://pujowelitolav.weebly.com/uploads/1/3/1/4/131438356/7015968.pdfIn PDF document text
    • https://pewaruraxifazof.weebly.com/uploads/1/3/4/3/134340131/0d2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405907/normal_605b65d29372b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367925/normal_5fe6f32dd7cb0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5feed1b104b8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nudagimanefej.atwebpages.com/causes_of_lung_cancer.pdfIn PDF document text
    • http://wasaxotudulolo.epizy.com/baba_koto_din_dekhina_tomay.pdfIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/attain_noun_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/nuvejodo.pdfIn PDF document text
    • https://s3.amazonaws.com/luborinizu/gulosuwasuvep.pdfIn PDF document text
    • https://s3.amazonaws.com/punagilelabon/vokizogefeliralunosaz.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_off0000fff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF1 5468 bytes
SHA-256: f490b75e9e52f40785b83e8a4d9810aed4aa8743d262508224b6d713408b30b8
font_01_sfnt_off00011273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11273 11500 bytes
SHA-256: 6d4297fc767c7b6c4a0a54ceaf2cf5679138242209f4274514f514d047325860