Malicious PDF — malware analysis report

Static analysis result for SHA-256 66dbe5d3dda16e41…

MALICIOUS

PDF

86.4 KB Created: 2021-09-20 02:57:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a16e7fe7efb8d1448e032e42b2768268 SHA-1: d98d0b1fd1300b95264dd5139a422d342e76f9c6 SHA-256: 66dbe5d3dda16e415ce05e63acfabbeded9effded5653828f692e9ee8bccf7e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to disposable domains, suggesting a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further indicates a malicious intent to redirect users through multiple links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://unseretochter.ch/images/file/18384372275.pdf In PDF document text
    • http://jszl-rolls.com/filespath/files/20210914130230.pdfIn PDF document text
    • https://mayphoviet.com/media/ftp/file/99189552637.pdfIn PDF document text
    • http://elvirajogsi.hu/ckfinder/userfiles/files/84336125110.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/lasunegamonera.pdfIn PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/gepabun.pdfIn PDF document text
    • http://janjoling.com/public/ckfinder/userfiles/files/voged.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/35968055886.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/nilamedifopu.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/gezovixipigiw.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/wixopiwozogagovolefab.pdfIn PDF document text
    • http://quanhoangtsi.com/upload/quangtri/files/sopomowi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161415c7271e78---5328077936.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/37331083871.pdfIn PDF document text
    • http://pfollowers.com/ci/userfiles/files/napazozu.pdfIn PDF document text
    • http://dastone.ru/userfiles/file/wexerofomiwipozasegiso.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/wukebabudi.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/14950973638.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/tokoledapurune.pdfIn PDF document text
    • https://cosmopolitanhotelbg.com/uploads/wysiwyg/files/81427329395.pdfIn PDF document text
    • http://trubaopt.ru/content/file/1734137964.pdfIn PDF document text
    • http://china-miyaco.com/img/file/2021917222310.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/21997595560.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/no8k98p8fvoaarmr6j0opvhfl9/78782750588.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/30394185571.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=the+love+witch+123moviesPDF 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_off0000e9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 10588 bytes
SHA-256: 066c9f3774abe586445a931f44d69056044b00a255ca4fb00aaafe20e28258bc
font_02_sfnt_off00011a6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6E 18824 bytes
SHA-256: cb9649f5c11744c875783427f94748b40f157c715d0611da8a93b7a3cbce6008