Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceb9be4b68f994f5…

MALICIOUS

PDF

120.2 KB Created: 2021-01-10 07:56:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: ea877613d1835673b801822598f9cc06 SHA-1: e33fd0dd58e8f704449ca23ce9df519d92c96f1a SHA-256: ceb9be4b68f994f50231e63504c7ca10f0131206e956db6e0cf4b82793b0d6dd
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a malicious redirector. The ML classifier and ClamAV also flagged this PDF as malicious. The presence of multiple links to disposable hosting and the use of UTM parameters suggest a phishing or scam campaign aimed at directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/123?utm_term=lacostetouch+of+pink In PDF document text
    • https://site-1176114.mozfiles.com/files/1176114/playseat_f1_instructions.pdfIn PDF document text
    • https://site-1175497.mozfiles.com/files/1175497/42038330103.pdfIn PDF document text
    • https://site-1168115.mozfiles.com/files/1168115/earn_to_die_2012_part_3_hacked_unblocked.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365570/normal_5f88aa4852c5b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460983/normal_5fb2b40957ebe.pdfIn PDF document text
    • https://site-1174390.mozfiles.com/files/1174390/78014831409.pdfIn PDF document text
    • https://site-1180493.mozfiles.com/files/1180493/worship_songs_mp3_mdundo_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404757/normal_5fc2aaab9129e.pdfIn PDF document text
    • https://site-1176683.mozfiles.com/files/1176683/sherpa_assistant_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxiropuwomo/ifUTXN9/tujuxinunax.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5fe3523b17b27.pdfIn PDF document text
    • https://site-1171806.mozfiles.com/files/1171806/82857622169.pdfIn PDF document text
    • https://cdn.sqhk.co/sejixikerut/Sidjd3w/paper_and_pencil_games.pdfIn PDF document text
    • https://site-1174761.mozfiles.com/files/1174761/46782458980.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn 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_off000182a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182A4 4980 bytes
SHA-256: eacbdd0de096db456f9e564a2dfe1ddc1e9267cb5a5dcda32e7efa95eeff8d54
font_01_sfnt_off0001939c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1939C 12188 bytes
SHA-256: 202adcc567f72b12656e79289d58106a2c4627d8962fa02bccf5e1198d759cdb
font_02_sfnt_off0001bcff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BCFF 16164 bytes
SHA-256: d781c508aaf473e50263a6aabc3f4161b7fa10724c54bb8d35addee38a7f1c44

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