Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7030bc42947717…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 02:49:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cdc5ac9570dd78738ef329ab891f7319 SHA-1: cfee5bfaafd9b167e6a4f1fdfc459c06cc4bebdb SHA-256: 6d7030bc42947717436c8774c8f846b01b9438ae6c5ebc6fe6de3f0885e646f1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm on disposable hosting. The primary URL suggests a lure for a game download, indicating a phishing or social engineering attempt. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://medvor.ru/uplcv?utm_term=resident+evil+2+remake+free+download+for+android PDF link annotation
    • http://kraemer-duennebacke.de/files/file/subagorovetomoviwoteniwix.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/pokozeroda.pdfIn PDF document text
    • http://honderhotel.com/UploadFiles/FCKeditor/20210914061612.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/somipenenaboxin.pdfIn PDF document text
    • http://online-cycling.com/files/file/60617659485.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/66750927083.pdfIn PDF document text
    • http://exosportsante.fr/ckfinder/userfiles/files/44461284725.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/99791744315.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/9260863918.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1sg6q4dgjgkte7l95b71s0ok53/sefuvedijijawikiganof.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/97777356683.pdfIn PDF document text
    • http://propack-th.com/image/upload/File/69308149922.pdfIn PDF document text
    • http://vwtint.com/userData/board/file/zidareni.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/xezanofuvuguzujarigelik.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/sidulo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210901092843.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/labegubeguzezedujupiv.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/fuvibeluposakanemeditej.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/91893346664.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/satas.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141837e81ad9---67884133211.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/12085387004.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/45013787710.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210901124219.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_off0000e109.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE109 10924 bytes
SHA-256: de0dabe387d12ea2f6556db56ca4e3c7a005948ef5a010708bf184972b77a651
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11285 18140 bytes
SHA-256: 1d4b4916f5edefeba279841651d25e388a0f9be4a6c9297227c3fc4e66453692