Malicious PDF — malware analysis report

Static analysis result for SHA-256 27ebf329cd883f08…

MALICIOUS

PDF

95.6 KB Created: 2021-09-14 21:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 06242d600a70bee9871f856b67987e6f SHA-1: c98e67ab309af173a9fa617ca02e734710cdcca1 SHA-256: 27ebf329cd883f08faaf5e774d9ef39f1896835f3107567f844e6f67b7e314c3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external URIs, including one that appears to be a redirector with UTM parameters, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links indicate an attempt to direct users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://cructi.ru/uplcv?utm_term=vidmate+new+version+2021+free+download PDF link annotation
    • https://www.frontiermea.com/sites/all/libraries/ckfinder/userfiles/files/44806508173.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/bimedaredomujodiwoteguza.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/zobemabimofovaz.pdfIn PDF document text
    • http://smogy.ru/files/files/wedaxuge.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/5ffdff7cc98ab133597d8a51500f5bf4/tuxerobax.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/sijiwazir.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/ruwemumozosokolepe.pdfIn PDF document text
    • https://comfortinnbarrie.com/phpsites/vertical_living/uploads/file/wexafufabe.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/wopabebusefatuvizimora.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/8487335832.pdfIn PDF document text
    • http://telecycling.info/files/file/14429454001.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109091505489070.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/91428907668.pdfIn PDF document text
    • https://mbbs.hr/files/vepekuliludibawuf.pdfIn PDF document text
    • http://jarosi.hu/files/file/dotapi.pdfIn PDF document text
    • https://fa-vietnam.com/webroot/img/files/doparuzexikaxunepa.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/0qe0vmo48ur2j6m3fgnnfoh9h7/97253018141.pdfIn PDF document text
    • https://wonkingchina.com/d/files/21105221161.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/34740789368.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202191747549343.pdfIn PDF document text
    • https://inprovitperu.com/ckfinder/userfiles/files/22394732384.pdfIn PDF document text
    • http://optimumnieruchomosci.pl/uploads/userfiles/files/20045571902.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lugufanufekorezipased.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/jagojelejagakilige.pdfIn PDF document text
    • https://ikorti-iao.com/userfiles/files/19603916224.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://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_off00010f4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F4B 18316 bytes
SHA-256: 8cc93729e2abe19d9b415896659b05bb153131207dd7e02396438026fa608125
font_01_sfnt_off00013ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EC1 10932 bytes
SHA-256: 3bd2e039416432835df523d294bed361a4d818e56a5a04d688422b65e6908d56
font_02_sfnt_off00015835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15835 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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