Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4e81a6b6d82b445…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 05:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7afee247aa12ea61b8d394c26bcf7c6f SHA-1: d20ad474434427ed51da4a7c6cdbb827cee28dc6 SHA-256: d4e81a6b6d82b445cf7407c4f9bbdb66e969cff9ca2655faf58aadd444e08e8e
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains an embedded JavaScript stream and multiple external URIs, suggesting an attempt to redirect users to malicious sites. The document's structure and content indicate it's designed to trick users into clicking links or downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9851

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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 http://arniuniversity.in/ci/userfiles/files/3764393281.pdf In PDF document text
    • http://saaretravel.ee/images/file/tabunapegalisusegedof.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/vubedabufegubetirikotegu.pdfIn PDF document text
    • https://gulceoyunlar.com/calisma2/files/uploads/54983456216.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/81604456961.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/rizomijeguvewinij.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/13299922333.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/kawuwoxezitadununiw.pdfIn PDF document text
    • https://euchebnici.com/img/file/55538753989.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/palixuvarumutaximodisifej.pdfIn PDF document text
    • http://hklh.vip/data/attachment/file/xobujepolafurekixubewefo.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137ff46c0ea4---sakikoka.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/4408913640.pdfIn PDF document text
    • http://dopuskvsro.ru/UserFiles/zolakikejijumog.pdfIn PDF document text
    • http://ibrahimabuomira.com/ckeditor/ckfinder/userfiles/files/tiranorokokikireda.pdfIn PDF document text
    • http://actinq.nl/upload/file/39904734834.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/27111996635.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea9efca9e4---85719300227.pdfIn PDF document text
    • https://spa-salon.ru/ckfinder/userfiles/files/63407998836.pdfIn PDF document text
    • http://werder-ritter.de/UserFiles/File/87955270212.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/23623052014.pdfIn PDF document text
    • https://www.theoakshealthcare.com/my_content/js/ckfinder/userfiles/files/repupenuwiwufetonasib.pdfIn PDF document text
    • http://soncongnghiepjotun.com/media/ftp/file/46100573432.pdfIn PDF document text
    • http://jowinbio.com/upload/files/202109221603227708.pdfIn PDF document text
    • https://postelezmasivu-liberec.cz/ckfinder/userfiles/files/23246765098.pdfIn PDF document text
    • https://jaurrieta.net/USERFILES_JAURRIETA/files/rejakugil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=psiphon+pro+goldPDF 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_off0000b093.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB093 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8A5 14280 bytes
SHA-256: 5891e3f0220b5b6ab032548afff7647036c3d0727206ee9c8ca0f0cbe2ebd060
font_02_sfnt_off0000ebf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF1 10280 bytes
SHA-256: 7419c40a3e344e93b87bda5ac950a9bc0f16a9b585510fa9e28d610233c541c3

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