Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca413655b3578cac…

MALICIOUS

PDF

83.6 KB Created: 2021-05-05 20:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: beda49ea9f5fe9cf09ede32cd62aabd3 SHA-1: 1a1ab69c2dd512dd869f8f33d3576931c3c51787 SHA-256: ca413655b3578cac6e290ce73e6051ac12eaaf4f7ec51fa4d209886eab6bd644
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, with a primary suspicious URL being https://xajibur.ru/strik. This suggests the document is designed to redirect users to potentially harmful content or initiate further malicious actions. No scripts were extracted, but the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

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://xajibur.ru/strik?utm_term=what+is+yoga+flow+for+beginners PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4499282/normal_601153a21d44b.pdfIn PDF document text
    • http://kalukawuwo.mygamesonline.org/all_divergent_books_in_order.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485809/normal_5fcebb0a9625b.pdfIn PDF document text
    • https://cdn.sqhk.co/fodexuxefeba/fhbDrBd/heroism_pathfinder_pfsrd.pdfIn PDF document text
    • https://cdn.sqhk.co/vavewiminiv/5GiiShc/kaiser_permanente_24_hour_pharmacy_near_me.pdfIn PDF document text
    • https://givadebar.weebly.com/uploads/1/3/1/4/131437750/xenoxidoles.pdfIn PDF document text
    • http://joxezorov.mywebcommunity.org/reading_and_writing_skills_curriculum_guide_deped.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370996/normal_6039652d46d40.pdfIn PDF document text
    • http://gukolifuk.iblogger.org/2904203304.pdfIn PDF document text
    • https://refunijuxi.weebly.com/uploads/1/3/4/7/134748157/jimakodapuruf.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/jf0QYji/asteroid_earth_nov_2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_60248c016f14f.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/c9M6gjq/makoseke.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417030/normal_5feb47916ade0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tivexedasabuxi.myartsonline.com/maths_formulas_list_class_12.pdfIn PDF document text
    • http://vorukozepinuvu.epizy.com/pirates_of_the_caribbean_theme_easy_piano_sheet_music.pdfIn PDF document text
    • http://lerakegubonigob.epizy.com/2038202896.pdfIn PDF document text
    • http://zakuvusebaj.epizy.com/tarif.pdfIn PDF document text
    • http://danijikuguwidak.rf.gd/77936029101.pdfIn PDF document text
    • http://pububaba.epizy.com/archimate_viewpoints.pdfIn PDF document text
    • http://pejefovad.epizy.com/antiquities_of_the_jews_by_flavius_josephus.pdfIn PDF document text
    • http://xexobazetozi.epizy.com/orculo_manual_y_arte_de_la_prudencia_baltasar_gracin.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_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 5376 bytes
SHA-256: 4bdf0a4cb9d013c04991b498d453d38bf247f3b09ad2319a249ebe524662e164
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10680 bytes
SHA-256: bcf5d6022ad6c1c099c90cdc1848bb704ec29550c3dcaad39ed52662fafc56f8

Open this report in the interactive analyzer, or submit your own file for analysis.