Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7addec1b1ce272…

MALICIOUS

PDF

75.7 KB Created: 2021-09-16 21:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3e59c2f40143d8ac337eea106d97af3f SHA-1: e6866911d06e6de0ceb3fbdcee4f464d9527a03b SHA-256: 0a7addec1b1ce272d830083b3bf1bce6bd8f16e99511cfb7dd632f995fd0ec9c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with one specifically pointing to a URL containing 'real+racing+3+mod+apk+all+unlocked', suggesting a lure for potentially malicious software. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is designed as a link farm on disposable hosting, further supporting a malicious intent to redirect users. ClamAV detection confirms the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://coretry.ru/uplcv?utm_term=real+racing+3+mod+apk+all+unlocked PDF link annotation
    • https://deltarents.com/upload/ckfinder/files/91570906381.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/vesinigotenejamezorid.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/sosodoboz.pdfIn PDF document text
    • http://biomehl.com/images/content/files/mubovaxusedogomo.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/59555649404.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/55039674980.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/41242682228.pdfIn PDF document text
    • http://coffee33.ru/archive/file/tutabipowagarelat.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/40102697634.pdfIn PDF document text
    • http://papierplus.pl/userfiles/file/vegipalatalomovudoludo.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/bezenajoluzibapara.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614067bf2cad9---50810493354.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/nejetokexurezunuvot.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/renidajinimajevukuxe.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/rapubesid.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b304764f79---45498036314.pdfIn PDF document text
    • http://www.prieteniitehnicii.ro/documente/file/posedef.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/41505514430.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/wuzadariw.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/jevovavazus.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1613347b445c69---betegetuwobojomaki.pdfIn PDF document text
    • http://www.elstar.ru/uploads/files/lavogoselapusesopabota.pdfIn PDF document text
    • https://sua.vn/uploads/userfiles/file/20711282170.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/32399335635.pdfIn PDF document text
    • https://vnmmalta.com/userfiles/file/vidisepegif.pdfIn PDF document text
    • http://tes-sys.com/uploads/ckfinder/files/20210911/16313616506557.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_off0000c290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC290 11000 bytes
SHA-256: 3476ef1e24535099d78f8cca75dd610dbae76d794dce865131a234db8e8453f2
font_01_sfnt_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F1 17408 bytes
SHA-256: 5479b124908a962d28547ad6afcd748afab0f8568c40ed4029744c066560b287