Malicious PDF — malware analysis report

Static analysis result for SHA-256 962527a69b9cf5e8…

MALICIOUS

PDF

77.5 KB Created: 2021-09-17 01:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 42e1156aa4d46223cdd06a9d754a32f7 SHA-1: 419d4adb48d2b8a8b5e5ef57fbadc6e1ff5dd1ee SHA-256: 962527a69b9cf5e84887020607de3c6eb7568fc49dc50cd08abc322d733d3833
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=moto+g7+play+update PDF link annotation
    • http://studiocinti.eu/userfiles/files/loponuba.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdcbfb4501---54399372870.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/16304796261.pdfIn PDF document text
    • http://lafiestadelmoto.cz/files/file/janebudurewojigomavivu.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/21414979526.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/56474828206.pdfIn PDF document text
    • http://dejede.com/userfiles/file/43713548092.pdfIn PDF document text
    • https://mallarpurnaisuva.org/go/file/12451179079.pdfIn PDF document text
    • http://tongshengchem.com/ckfinder/userfiles/files/suzugixosi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091606283027.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puzap.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/wibezipedatukofupaxit.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/defatepajolugupewu.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/67701879612.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/6134c2c5c735f.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f8a63f14d12fb67f4d8bc8d033032c7e/vidotikejofigiraded.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/59985067736.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/22806952724.pdfIn PDF document text
    • http://bestbelly.org/content/files/files/sukedirakidadetev.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/23186186295.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/jafepumexosedazojusej.pdfIn PDF document text
    • https://locktactyuma.com/ckfinder/userfiles/files/66814888926.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/3147363683.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_off0000cb42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE359 10360 bytes
SHA-256: 17075a02b232d56bc37cb40708062c79f018e03974d87b95c1ee2e194753147c
font_02_sfnt_off0000faca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACA 17692 bytes
SHA-256: f29ca9972b9b4c8877f0c197a009a28d3146e08a3f30496049a86c3710636f29

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