Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1fc57e07f953ca…

MALICIOUS

PDF

70.2 KB Created: 2021-09-18 10:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca4dbf9e9a1aebbdcffee079153b4b9a SHA-1: 37959000381a50112029d6cf524d0bd70dc55776 SHA-256: be1fc57e07f953cae337fc105e93e68752b720f6d9a0caa82e657e3fcb7998c6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely for phishing or distributing further malware. The embedded URLs point to various unknown domains, reinforcing the link farm characteristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://imaggu.com/ci/userfiles/files/72499922010.pdf
    • http://kechengchem.com/upload/files/xagebosulaf.pdf
    • https://peintures-descours.fr/fichier/files/botoxakavokanadevafajuko.pdf
    • http://abwclayton.com/uploads/files/mogudivoderemuburikise.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/5qldga04m1c4t5f45004tmj3h2/96420053765.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/30291885012.pdf
    • http://inoxbienhoa.com/upload/files/tapukapovib.pdf
    • https://duvarkagidierzincan.com/userfiles/file/81286767838.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/88878089331.pdf
    • http://pointerboards.com/uploads/admin/files/jikepuzetarosevu.pdf
    • http://xutricolor.com/uploadfile/files/pitamu.pdf
    • https://investmentskillsgroup.com/images/userfiles/file/33154533531.pdf
    • http://www.aportecnica.com/imagenes/editor/file/kegudalixovorib.pdf
    • http://topnotchimports.com/ckfinder/userfiles/files/79842392543.pdf
    • https://bokaichenyu.com/upload/files/85211940322.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/bubowoben.pdf
    • https://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/nufawojuned.pdf
    • http://vstarmp.cn/upload/files/20210904_155121.pdf
    • http://pjteam.hu/uploads/20249495656.pdf
    • http://flirdining.com/uploads/files/xozozosudubokisaj.pdf
    • http://prestopc.it/upload/file/tinabivedavabivado.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2bcfe1ac0---50346864113.pdf
    • https://funbugs.ie/userfiles/file/dotixibodedep.pdf
    • http://slbreakingnews.com/ckfinder/userfiles/files/nowagol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+update+mi+tv+android
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b146.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 16792 bytes
font_01_sfnt_off0000c958.bin
b0bb24a6d9dab6409043ff230a381b5c40a427f02d2f4498cfe866d7a4d07f0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC958 16352 bytes
font_02_sfnt_off0000f348.bin
81abc0a6322ab3dc7605eac06f7e25ee9ada3050ab1193c1c00888a77be64e2e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF348 10584 bytes

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