Malicious PDF — malware analysis report

Static analysis result for SHA-256 e649251c7fa2348b…

MALICIOUS

PDF

91.6 KB Created: 2021-09-10 19:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 845aad9e41b5bae38092ef6ebbe121aa SHA-1: 1dce9124a16c878cd23027659b46c1436d01ed39 SHA-256: e649251c7fa2348bdb5b61042b9da262df81f9b6f15375597c1fdc56d1c9ee94
174 Risk Score

Malware Insights

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

The file is a PDF that was flagged by ML classifiers and ClamAV as malicious. It contains heuristics indicating it's a link farm and uses social engineering tactics, specifically a 'ClickFix' attack, to prompt the user to execute a command. The document body is heavily obfuscated and unreadable, but the heuristics suggest a phishing or trojan delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://autosaloncenter.com/uploads/files/dananoregotivinopasesajus.pdf In PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/24150530493.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/43445107906.pdfIn PDF document text
    • http://alfavs.eu/userfiles/file/beluvinukuzojokejurorasam.pdfIn PDF document text
    • https://cherrychile.cl/cherry/uploads/contenido/files/2450540104.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/83858440358.pdfIn PDF document text
    • http://sport-zavora.cz/data/file/lawinenumiti.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/nuwoxipoduxowufim.pdfIn PDF document text
    • http://primaneighbors.com/userimages/wemakovuwezu.pdfIn PDF document text
    • http://eko-uklid.com/files/file/zatimuselugasusa.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/bukamowojonaxom.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/24618484372.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/27903273524.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/12609057170.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343a6a29d5a---90930896123.pdfIn PDF document text
    • http://hevolta.com/upload/file/16946110383.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/14454678605.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/jukajon.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/fewobajipi.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/71304413136.pdfIn PDF document text
    • https://unicon-msk.ru/data/files/53189449939.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/8026348352.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/fopurigudunivu.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132fe0a1f6d6---defaxozeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=fun+things+to+do+on+a+minecraft+serverPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97A 17736 bytes
SHA-256: fb4bb392788ffe87086bd0e87e839a4c6c5814aa649686b790a003688b649a63
font_02_sfnt_off0001274b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1274B 18720 bytes
SHA-256: 9fc6e6df5fe7bff7b36b46ac96d98275fe909f7b8d2cbb1fd257f2ce605295db
font_03_sfnt_off00014540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14540 11020 bytes
SHA-256: 47a0ba2247ec432f4c2c5036eb94452b2c7f3dc257eef8f71da0b085936c56e8