Malicious PDF — malware analysis report

Static analysis result for SHA-256 dadcea49ba800beb…

MALICIOUS

PDF

84.0 KB Created: 2021-01-21 04:14:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 638ef7b630b8bc76f23b9a103778ebc6 SHA-1: 7914e1ab0da8053632898a9db66e8cf8c54175f6 SHA-256: dadcea49ba800bebbdb7b26ba3c01e6f762e28c56a554f9de92ac283700e5197
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of links on disposable hosting and redirectors, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and the 'link farm' heuristic point towards an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffnew.ru/123?utm_term=saturday+in+japanese+romaji PDF link annotation
    • https://cdn.sqhk.co/ruwonumatag/kI9gwgd/jaritakuvujogow.pdfIn PDF document text
    • https://site-1189714.mozfiles.com/files/1189714/transformar_de_grados_kelvin_a_rankine.pdfIn PDF document text
    • https://site-1166675.mozfiles.com/files/1166675/arrow_down_and_right_symbol.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/buhcgdi/super_soccer_champs_2019_apk_hack.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476765/normal_5fce52972b146.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378393/normal_5f8d2ec8ec429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454824/normal_5fbb195dc8ce9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383160/normal_5fa646e28e4f3.pdfIn PDF document text
    • https://cdn.sqhk.co/disonixures/pHia0K1/best_free_ringtones_for_iphone_7.pdfIn PDF document text
    • https://site-1249599.mozfiles.com/files/1249599/integrated_math_2_student_journal_answers.pdfIn PDF document text
    • https://site-1175354.mozfiles.com/files/1175354/garebadejifivobolikufib.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/AjeGTec/vupex.pdfIn PDF document text
    • https://cdn.sqhk.co/xexisini/ixjfijV/ximafina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374532/normal_5f98d5a33555f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425926/normal_5fa0afcb9f6f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386830/normal_5fad7a330d09a.pdfIn PDF document text
    • https://site-1243690.mozfiles.com/files/1243690/indesit_semi_integrated_dishwasher_installation_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5fcef6647adec.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nijudow/gijozarefiberiwisepavus.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2B3 6804 bytes
SHA-256: f6a2dd9b04bba0eadd2d62e925386be1f23803503dbdbe5995f206f17b707d63
font_01_sfnt_off0000e3bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BB 8896 bytes
SHA-256: e92ca8a71b93d111673ea23a1431d48426da28bf1089857c6ac43d2e76da7336
font_02_sfnt_off00010120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10120 5356 bytes
SHA-256: 4e084462da1ccd3cd5401bbb3270e41c25c0330a8bd1825c7280d3871771b8cb
font_03_sfnt_off00011342.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11342 1800 bytes
SHA-256: 38de4adb1cf14aaef0f812a03f63eaa0f24506463b727e68d006a2a692d1332f
font_04_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 11532 bytes
SHA-256: 83b83d433649f9acd9359aae5cb3ab39dfd1f101341582b36575b1b411a7f4b0