Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3cd3b4f9b03781…

MALICIOUS

PDF

79.0 KB Created: 2021-09-21 07:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 22cff37202d2eb91d5ebd78b25bbcc70 SHA-1: 2ddcf08400a49dca7053374bb372c75688067995 SHA-256: ca3cd3b4f9b037816b532582e6dcb607e7a1a72233989c7fdcf3aaa89bbaf60f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic firings indicate this JavaScript is likely used to redirect users to external URLs, as evidenced by the numerous unknown-reputation URLs extracted. The ML classifier and ClamAV detection strongly support the malicious nature of this file, classifying it as a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.prshots.com/ckfinder/userfiles/files/rejale.pdf In PDF document text
    • http://js-space.de/userfiles/file/42875479232.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/rufon.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/30295053959.pdfIn PDF document text
    • https://delcinfo.ru/img/files/files/41474724477.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/judujazodokamimuxurepalin.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/fadisinidezuxusiwiw.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/bixunurexulo.pdfIn PDF document text
    • http://studiopol.com/userfiles/files/piluxubalajapotaxoxilas.pdfIn PDF document text
    • http://canoeing.by/pics/files/22899224922.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/xirifixubajuvesozimi.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/36479395021.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613395352e132---33314957900.pdfIn PDF document text
    • http://laptopplus.be/app/webroot/files/userfiles/files/jokojatadugibitizim.pdfIn PDF document text
    • http://studioingtassinari.eu/userfiles/files/redebamamixarukilu.pdfIn PDF document text
    • https://yarpaket.ru/userfiles/file/21985719916.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/10771759027.pdfIn PDF document text
    • http://dispensapertutti.com/userfiles/files/fupazofapizebonef.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141eda5014a1---93212403753.pdfIn PDF document text
    • http://heldermusic.nl/ckfinder/userfiles/files/xiwajujonizagusawon.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/namebiworotubexaje.pdfIn PDF document text
    • http://videocycling.info/files/file/72983632752.pdfIn PDF document text
    • http://cn-biyoute.com/d/files/mirur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=berserk+deluxe+volume+1+pdfPDF 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_off0000cf23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 17780 bytes
SHA-256: 9d9efb4cb1c3e5e07130b4359b8481afd5d24d12a064379403f0eecdcd50da31
font_02_sfnt_off0001159e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1159E 10668 bytes
SHA-256: 49f7c312d76e47d1213d4983782fe6ffd9dc131b381bd720fe56ad54c7385045