Malicious PDF — malware analysis report

Static analysis result for SHA-256 fca88bd2b1d22e0e…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 06:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5b857b3eddd336547bcb5664b5c086c1 SHA-1: 737e7d3fcde92667ccd9892f1af4d85ee965a6e7 SHA-256: fca88bd2b1d22e0e58b196f59cc56fb656f2e646f6cd6d015885aba48a19637b
134 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is a common technique for downloading and executing further malicious content. The presence of numerous external URLs, many of which are linked to PDF files, suggests a phishing or credential harvesting attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. 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 http://hoshitorionline.com/uploads/files/bejajegimugijirubadabepus.pdf In PDF document text
    • https://gaadalagi.com/contents/files/dojoxuzelutuzetivasovop.pdfIn PDF document text
    • http://www.yt333.com/userfiles/20210911/file/1631324345.pdfIn PDF document text
    • http://touristclub.in/userfiles/file/novabebogadagetalilegiki.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/21328258663.pdfIn PDF document text
    • http://axwelindia.com/uploads/57228671487.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7ae30cba79ea93008debbb22adb65f3e/123084961.pdfIn PDF document text
    • http://protectakoteasia.com/ckfinder/userfiles/files/71809453362.pdfIn PDF document text
    • http://greenearthgardens.org/userfiles/80398834595.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/jorufejofatazalunom.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202108311857063645.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/96973699775.pdfIn PDF document text
    • http://evo-models.com/uploads/userfiles/files/vofofipirologe.pdfIn PDF document text
    • http://ilsungwarehouse.com/userData/ebizro_board/file/nusapawemigubiwunuguzew.pdfIn PDF document text
    • http://canyonmeadows.org/userimages/fizisorasi.pdfIn PDF document text
    • http://ekogamma.pl/javascript/ckfinder/userfiles/files/3986734243.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/76720045132.pdfIn PDF document text
    • http://busankid.com/webfiles/board/file///nijojufidum.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/19930347676.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613514701713d---97337009877.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/wiruz.pdfIn PDF document text
    • http://gardens-spa.com/user_pict/file/sivaxuselug.pdfIn PDF document text
    • http://gpshardorawal.com/hemkunt/userfiles/file/15952934491.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/59013507465.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/81295556901.pdfIn PDF document text
    • http://master-vin.ru/files/file/pijiziles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=iphone+screen+not+detecting+touchPDF 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_off0000ec95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC95 18496 bytes
SHA-256: 6e25017be4336704941681043c40a4b1f581e967807d159a3e946cf3a599c0ae
font_01_sfnt_off00011d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001357a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1357A 10636 bytes
SHA-256: 2c4cc723407a3c1cf4c764adfd28d473f33cc84ce5cf0e8c003d567e1995dee2