Malicious PDF — malware analysis report

Static analysis result for SHA-256 79f5839ff93278ba…

MALICIOUS

PDF

82.1 KB Created: 2021-09-20 07:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c249bfba03b82d092bb1cbf0b462282b SHA-1: c52cd6f5ef0975157610af714eb249fed69c6962 SHA-256: 79f5839ff93278ba80c8b96e74a676053d5367e8dc94afef7a2a25b6f0408709
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics identified it as a link farm with numerous embedded URLs, suggesting a phishing or malware distribution scheme. The presence of 'utm_term=injector apk for pubg hack download' in one URL further points towards a lure for potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://egyseg.eu/ckfinder/userfiles/files/2513579142.pdf In PDF document text
    • http://coolbiotech.com/upload/files/47669837144.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/ritumejukububumuvejanu.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/14474697234.pdfIn PDF document text
    • https://bleikss.com/userfiles/file/58680248183.pdfIn PDF document text
    • http://ngocvietbungalow.com/upload/files/48858761056.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/suwibumeni.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210909_2F24BEB38E85DA2E.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/mafaraxusipavozake.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/vaxeferawax.pdfIn PDF document text
    • http://chinalabware.net/d/files/livoseberilalinimoz.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jazepuno.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/33739852498.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/jukumobasuvuw.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/wonetovozigitasib.pdfIn PDF document text
    • http://axi-hohenstein.de/userfiles/file/51790682684.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/e0a7c0bbcdf081ec43d279641470ec96/sopekijibemusinukuli.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/23226581872.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/deverikolijipebugi.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/zolozukekelux.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/rolod.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613621c96c853---rufosoxufurugetenelenipak.pdfIn PDF document text
    • http://rayanchem.com/d/files/29703077342.pdfIn PDF document text
    • http://locke-3c.tw/uploads/files/202109100624551373.pdfIn PDF document text
    • https://tybistanbul.org/resimler/files/wudozusupamejete.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/pepofigosewulisaju.pdfIn PDF document text
    • http://knipia.com/userfiles/file/54207679894.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=injector+apk+for+pubg+hack+downloadPDF 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_off0000dcc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D7 11136 bytes
SHA-256: 06873c2d95595e4d3914c7a4f57b2d732560a80bd948c5760aac71cf2e4ee5ca
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 17024 bytes
SHA-256: c1c8f231ba348be05b56168970d12e2c522df092eebdfdc74d089758063f5b70