Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0cb68e2032f3875…

MALICIOUS

PDF

72.7 KB Created: 2021-03-19 09:05:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea706b6a130612a3e45922b6b97b1d4 SHA-1: d1d34598dd36eec03bd73aa90dc5da3bf4880bdc SHA-256: b0cb68e2032f3875c467f1a0e2b6ae3c2ae0adbdfbe14418b94c0dc53a15bd1a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded URLs are used to redirect users to these external PDF resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://soxebez.ru/award?keyword=balwant+gargi+books+pdf+free+download
    • https://fazolusafiwef.weebly.com/uploads/1/3/4/5/134585025/sutexu-fipiperad-nadaw.pdf
    • https://kexibisurek.weebly.com/uploads/1/3/4/3/134334279/kevitifan-wafef-rapidamila-zutiposok.pdf
    • https://cdn.sqhk.co/talurelope/ajjUqhd/36005075338.pdf
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/7f54a1edcdc1.pdf
    • https://cdn.sqhk.co/jomububorava/jhGjhnu/wilson_evolution_basketball_black_friday.pdf
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/sarusux_gazopofadir_mararafujapu_xoloroj.pdf
    • https://cdn.sqhk.co/sowodopevew/RE9Fjf0/pazejomumakupobeloworal.pdf
    • https://cdn.sqhk.co/zipirevofu/EjhWqru/xaguguwuremududasonuga.pdf
    • https://cdn.sqhk.co/fusozuwalas/rha9ibz/tic_tac_toe_game_in_javascript_source_code.pdf
    • https://cdn.sqhk.co/wumidimux/fym7hf2/hearts_online_free_play_ok.pdf
    • https://resonorur.weebly.com/uploads/1/3/4/8/134874279/dubunesiburetitalu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jewizopukuni/feather_activity_worksheets.pdf
    • https://s3.amazonaws.com/dedinavesute/29238799785.pdf
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_597ac2c3c757411f991a3bcac76c4b70.pdf?index=true
    • https://cb38ef3f-1f2c-4622-8962-dca261660167.filesusr.com/ugd/3ae201_fb610f058cf9415383a94d451ceeb95e.pdf?index=true
    • https://s3.amazonaws.com/tuletivotarupu/nba_grizzlies_injury_report.pdf
    • https://s3.amazonaws.com/supefujoxopubu/lixeto.pdf
    • https://s3.amazonaws.com/negonanopix/63950589356.pdf
    • https://s3.amazonaws.com/navoburarovada/xaxil.pdf
    • https://s3.amazonaws.com/lorifawuvawot/rbol_es_aguda_llana_o_esdrjula.pdf
    • https://s3.amazonaws.com/widetunipet/whatsapp_for_windows_10_computer.pdf
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_b7f4747734994e1380f86b7d584f609f.pdf?index=true
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_b98daf11cfcf477c9394d716df04f939.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcee.bin
1a3837ee6c296aa3efae56f34e73b0a8d78b5c55b35de5588cc81b20deb4ee8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 5552 bytes
font_01_sfnt_off0000eff3.bin
408ecf5e31ba0451a8555ae9901fecf630ad2ad7943e12137a59e9e48776f64b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF3 11108 bytes

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