Malicious PDF — malware analysis report

Static analysis result for SHA-256 91d52db987303635…

MALICIOUS

PDF

69.3 KB Created: 2021-09-28 06:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6d7c487db001c350f4621c4f8918c5e7 SHA-1: efd95c42ca671bc4fb32dfdd43eddfcd9aecda80 SHA-256: 91d52db98730363530cd88f7fc54aece908008a9158e1b9668f7ba913abc7756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and employing UTM parameters, strongly suggests a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://huntic.ru/uplcv?utm_term=you+only+live+twice+stream PDF link annotation
    • http://lidaoxc.com/upload/files/jurenikozijifezebufevapud.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/94990558686.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304af99a37d---1940350926.pdfIn PDF document text
    • https://onutglen.com/caningest/images/file/6964654527.pdfIn PDF document text
    • http://cinebuzz.be/uploads/userfiles/files/sasobobozamavurajes.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d6d1f1cd7e---47574733584.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/tolegaponagenupotamorawo.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/foxogusawovokasigutas.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/dumexosikopit.pdfIn PDF document text
    • http://pure-chiral.com/upload/files/buwuwi.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/kasafetoraguwap.pdfIn PDF document text
    • https://petek.biz/resimler/files/78209738425.pdfIn PDF document text
    • https://fullgame.hu/uploads/files/nakasefitaxeva.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/4690962024.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/jutabuxototi.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/rawijepodanefobapa.pdfIn PDF document text
    • https://businesslife.com/content/files/zujanagirujedox.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/jexoxasiwidoretutimet.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091212082035.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/80245942670.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/85693144138.pdfIn PDF document text
    • http://studioego.cz/userfiles/file/batarebukedanitamatidako.pdfIn PDF document text
    • http://dream-mebel.com/pic/file/xopolesol.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/todumataba.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_off0000af43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF43 10740 bytes
SHA-256: bc8390513af412b787576309dc6592321165104ebf300f75dde806df48736785
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 16176 bytes
SHA-256: 1765b0f7a3bda12cc376c0939f2ce2576097a7105e8bfecc672daff4588d489d
font_02_sfnt_off0000efdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1