Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec104ce4e2d4193…

MALICIOUS

PDF

77.9 KB Created: 2021-09-13 03:13:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6250ca90a965f6f0f5f4c7cc6e11f084 SHA-1: a78e5879570de87cee97f2d241cb02819d2eb3f4 SHA-256: 1ec104ce4e2d41937db1295b86338a8a57516f77361dbad87f966e54b81db974
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for phishing or malware distribution. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to decrypt an archive, a method to bypass gateway security. ClamAV detection and ML classification further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=mobile+winrar+android PDF link annotation
    • http://checopharma.com/upload/files/vomet.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/nelokelitipawiv.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/12555316106.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/47139045124.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/6591444478.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/23463144182.pdfIn PDF document text
    • https://tsegypt.com/file/97123585650.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d25ae3773---sagidesuxi.pdfIn PDF document text
    • http://wsm.hk/images/uploadfiles/file/20422275184.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9d3ddc4921a40761e5c5af992db38cc0/fezeguximamopiguwixibo.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/jetikufedufetekorobakefa.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/buvabon.pdfIn PDF document text
    • http://computerdoki.hu/user/file/27795698318.pdfIn PDF document text
    • https://sainaudit.mn/File/vowodesajoze.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/21329534447.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/51179027446.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/kadugifowafew.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/55411178201.pdfIn PDF document text
    • http://przychodnia-felinskiego.pl/uploads/editor/file/vojinumajisexafib.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/6184732765.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/38539714554.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26579238652.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/98631411231.pdfIn PDF document text
    • http://infosierra.es/images/editor/87999201231.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_off0000cd52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD52 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE569 10192 bytes
SHA-256: 774907215c5162c853f92dba49936b0077afd430905020d2ab246f02ce7a4e40
font_02_sfnt_off0000fc54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC54 17636 bytes
SHA-256: 2b661d70d519f76c943045966eae0beb2e52a25c92a08e1dd646c73925c67d79