Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8cf5e9009fbedd0…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 03:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96ac678970455b77fca9fc0af4d4c81a SHA-1: 860a4e0dbc3240dcf1497b320e2e5863113cc9c4 SHA-256: a8cf5e9009fbedd0e423753a0a840c86b328416c85458b706addb4426b72f363
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The presence of numerous external URIs, many pointing to PDF files, suggests a phishing or credential harvesting attempt. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://willes-gb.com/uploads/files/202109101731039472.pdf In PDF document text
    • http://kastely-vacduka.hu/fileok/file/16585231406.pdfIn PDF document text
    • http://print-printonline.com/ckfinder/userfiles/files/mixep.pdfIn PDF document text
    • https://svenjakretschmer.com/ckfinder/userfiles/files/89385174564.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/2643973580.pdfIn PDF document text
    • http://doubler-son-capital.com/photos/files/25817052607.pdfIn PDF document text
    • http://paraglider24.de/pics/fotos/1/file/wesoregakuperusakevakudo.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead724e26e---jidifelugim.pdfIn PDF document text
    • http://aptekarynek.pl/zdjecia/fck/file/26426956343.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/jituxojewavunovid.pdfIn PDF document text
    • http://cycling-software.com/files/file/gesokamamovapotusozujed.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///mututufapufogoxujuwu.pdfIn PDF document text
    • http://www.pratikchoudhury.com/fckimages/file/tijuxiposarelulodaforudek.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/92225440779.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/20199167808.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/b233babd50bfac27fc361e8723803856/badalodekuxuwavizo.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/tosobemili.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/22915833716.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/99515302479.pdfIn PDF document text
    • https://fultoys.com/userfiles/82004448268.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/nusatiwowunipadodifonuduz.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/mojirexolepudo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=android+auto+tipsPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD44A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 10288 bytes
SHA-256: 01f2221a1fb4ad542d1d9968bd61249ea70eb819f2d01a334f44d81422543403
font_02_sfnt_off000103a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A5 18124 bytes
SHA-256: 624a8da647e520eb1f7bc3f8bd71b8449a644ccdad26a1f653f3cf1250645629

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