Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e5e4a4abc7270ef…

MALICIOUS

PDF

81.6 KB Created: 2021-09-23 03:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d538c522c7c3a95a94a8f929155990a4 SHA-1: 291a858a2f53eb6612be58a8d0d6c9131a802c06 SHA-256: 9e5e4a4abc7270ef04f36fa558d69980705372ebf1f0918f06ec8d81e8678063
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://garglob.ru/uplcv?utm_term=mi+themes+app+download PDF link annotation
    • https://cr2tek.com/userfiles/Proj_Name/files/60319736468.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/38055055317.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/rcte69kh9mlog6dj4mqd9gnvj2/viputopixogajexar.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/revizamenago.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/57a9af38da504e15482840ed1579a268/15840773522.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/nupixajufugunuru.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/gedejumu.pdfIn PDF document text
    • http://kaitianjinghua.cn/admin/userfiles/file/202109031524174949.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210921075625.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/4441598903.pdfIn PDF document text
    • https://festival-bg.com/media/ckuploads/files/taxidewinojetixuz.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/dosizezizilime.pdfIn PDF document text
    • http://etnorom.hu/pictures/tijetuluxojugegepoz.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/68509409238.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468287afa5d---82200008284.pdfIn PDF document text
    • http://www.520amis.com/upload/files/20529329579.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/rexariniwiba.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/viwilegokinomot.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/nelaradexexe.pdfIn PDF document text
    • http://vietdubai.com/userfiles/file/jajogenukavirosikeruke.pdfIn PDF document text
    • https://arerp.kr/data/file///96147486537.pdfIn PDF document text
    • http://kapsalonindex.nl/images/uploads/80727477707.pdfIn PDF document text
    • http://studiocastigli.eu/userfiles/files/kegiwibixuzemofop.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_off0000d839.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD839 10636 bytes
SHA-256: ca7e64bed6a551e0125d7219a6b5bdd19a462156da5a71334baa9f714278265a
font_01_sfnt_off0000f06c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06C 18764 bytes
SHA-256: 432d6cad2b725457b8a1853c0ac1e1a62c5025019f76ce5b2feaca9966b847c8
font_02_sfnt_off00012102.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12102 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1