Malicious PDF — malware analysis report

Static analysis result for SHA-256 40a57b36d5bd16f1…

MALICIOUS

PDF

92.6 KB Created: 2021-04-20 06:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 73970a96d2f57a556089ea93835586ef SHA-1: 179c3a94c1b7fe6982b12f2c8f642f804e2b4bb4 SHA-256: 40a57b36d5bd16f1f32f601d0ae8e606ba1b9ce2dd0f0f6229c0e424cc82e161
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'baarspo.ru' which is associated with a link farm on disposable hosting. The presence of these URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://baarspo.ru/strik?utm_term=legally+blonde+jr+soundtrack+chip+on+my+shoulder PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5fd33c4765df7.pdfIn PDF document text
    • http://fullpisetc.ru/raxozelorugunupuwamuzu56lqo.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/1327749.pdfIn PDF document text
    • http://liketsven.xyz/inteligencia_emocional_daniel_goleman_resumenelv5p.pdfIn PDF document text
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/56cf5f2fa82.pdfIn PDF document text
    • https://cdn.sqhk.co/wapevenupu/dhhhbjd/bandai_namco_store_europe.pdfIn PDF document text
    • https://sowozulame.weebly.com/uploads/1/3/4/7/134733070/645b1c48738c2.pdfIn PDF document text
    • http://bcpzonasegurape2-viabcp.com/76475543168wkii3.pdfIn PDF document text
    • http://sekijad.iblogger.org/html5_video_blob.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/7cid7ha/38159480780.pdfIn PDF document text
    • http://winoorama.fun/asmaul_husna_adalah_nama-nama_baik_dan_agung_bagitarr3.pdfIn PDF document text
    • https://cdn.sqhk.co/metumolalub/M9gdWha/58626957071.pdfIn PDF document text
    • https://fuvobavan.weebly.com/uploads/1/3/1/6/131637325/738005.pdfIn PDF document text
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdfIn PDF document text
    • https://cdn.sqhk.co/tusifefovozu/icjgiid/open_transport_tycoon_deluxe_windows_10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462350/normal_60421c88cff73.pdfIn PDF document text
    • http://azorocheat5.xyz/92915901793xjw8m.pdfIn PDF document text
    • http://sexedate69.site/razoluxugotaxafavujanule31yaz.pdfIn PDF document text
    • http://giocodigital.fun/samasofev8nhrp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vuregaxin.rf.gd/rakat.pdfIn PDF document text
    • http://jarawujutuva.epizy.com/break_even_analysis_numericals.pdfIn PDF document text
    • http://nomikidavex.rf.gd/internet_banking_system.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_off00012ac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AC6 5812 bytes
SHA-256: b7191f1f445557dbe754e156663f35f777cce8d5a7c3400397bf1579cf3b9f49
font_01_sfnt_off00013e6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6E 10536 bytes
SHA-256: 67fb30c07db891582801f17991ba949234cd213b2b6db75dcc2ce9b4e32653c0

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