Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceaef6b6f0717c3b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-14 03:50:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67575200f22c8a1738b146b9c363cca1 SHA-1: 4f723e0f408b959553c78cd1b3a098449275b9fa SHA-256: ceaef6b6f0717c3bae9c1ce58593d77ae6737e83f5245fe88c257d44e1ccc44c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and exhibits a high ML classifier score. It contains embedded JavaScript and a large number of external URIs, many of which point to potentially disposable domains, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/2109110755316149961hg1nr.pdf In PDF document text
    • http://hotelbasantresidency.com/uploads/69728590649.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/31285179125.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/nubunen.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/72426214426.pdfIn PDF document text
    • http://haitrungkim.vn/uploads/userfiles/file/64249787834.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/kijudupebise.pdfIn PDF document text
    • http://wellgroup.cz/UserFiles/File/panabesewewunuxuma.pdfIn PDF document text
    • http://haki.vn/uploads/files/buripapazutavoxugeduxoreb.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/pufojuvidirutojek.pdfIn PDF document text
    • https://cowik.pl/upload/2431269605.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/54018804356.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/wumokexomavoziwe.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/faliximigili.pdfIn PDF document text
    • http://maymaygiaydachidang.com/upload/files/wexujuwavileluti.pdfIn PDF document text
    • https://yantrasearch.com/ckfinder/userfiles/files/66619280104.pdfIn PDF document text
    • http://mail.me.ntou.edu.tw/ckfinder/userfiles/files/20210913_200550.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/vosovep.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/82097322629.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/39178859916.pdfIn PDF document text
    • http://szolnokepul.hu/userfiles/file/wizalefidasaxu.pdfIn PDF document text
    • http://strahyi.ru/images/file/3396606244.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/979986c760d5bee01aeda7278c7b108e/14650257190.pdfIn PDF document text
    • https://autoskola-scp.com/files/94212326183.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134613bb4dcd---39342304940.pdfIn PDF document text
    • http://tagsu.com/attachments/fckattachments/file/65033456347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=battle+cat+mod+android+1PDF 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_off0000c05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC05C 10468 bytes
SHA-256: eb28129977209ca50c3e870d98ca980e2be27aa2325d4b4b03d4a80cb78ada5a
font_01_sfnt_off0000d827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD827 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 18116 bytes
SHA-256: ddfcd7026b4db67aa20156609dec8f50a266ceef24088ae274673b3deee3cc94