Malicious PDF — malware analysis report

Static analysis result for SHA-256 e83e6b66d1de4623…

MALICIOUS

PDF

67.8 KB Created: 2021-09-20 15:09:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c5fafffa00b88585d1497a755a10bdc0 SHA-1: 4ef5f21ca3b0ebb65250302462f6f7f8afed5648 SHA-256: e83e6b66d1de46236372a56726996d4e0b98aa7318cc1db971b6c9e015d48a4e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. It contains embedded JavaScript and numerous external URIs, suggesting an attempt to redirect users to malicious sites. The document's structure, being image-heavy with minimal text and a clickable action, strongly indicates a phishing campaign designed to trick users into clicking through to a compromised URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 7

  • 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 67 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.
  • 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://queure.ru/uplcv?utm_term=best+wedding+video+editing+software+for+pc+free+download PDF link annotation
    • http://meta-min.com/files/4405794158.pdfIn PDF document text
    • http://rayanchem.com/d/files/sogowamofafevipo.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/nogalezil.pdfIn PDF document text
    • http://baodieptailor.com/uploads/2021-09-19/images/files/21108369139.pdfIn PDF document text
    • http://pilot-market.ru/new/files/file/69371235213.pdfIn PDF document text
    • https://qfuse.it/images/uploaded_files/ckfinder/files/1630447025_da67b78674.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/fapal.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/26357516972.pdfIn PDF document text
    • http://virtualcharityevents.com/vce_cake/files/files/84475166272.pdfIn PDF document text
    • https://truckforceone.eu/upload/editor/file/lamepafibexagaguwuwezugi.pdfIn PDF document text
    • http://fxlcd.com/upload/file/nivuwaret.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/28399735790.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lowametodaromasidiravuge.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/xinusebebiwisitufod.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/vuxarerixikawuwezelireror.pdfIn PDF document text
    • http://altinay-law.com/images/file/77930577428.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef7a0c96f---11320217374.pdfIn PDF document text
    • https://hearing-outlet.com/uploads/files/202109011919021253.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/lokojikosulafonisivigadu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/5eb481ef2e301b9902785129a9e6dae6/99107984795.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/melijijuxupuvetu.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31846002273.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/mupevumupukepavidekid.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_off0000add2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E4 13876 bytes
SHA-256: 2268d43b6245fa3602c8d9a3d04662a3f593e6645361016445a7fdd16ea4a46d
font_02_sfnt_off0000e7d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D4 11000 bytes
SHA-256: cec7c06fd43e60288f781c563fc40c2a3713c354ed8caa83e57120d004d66c61