Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5c5e1ce74b6daac…

MALICIOUS

PDF

79.0 KB Created: 2021-04-30 16:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d1cc40f68d8daaabf45f9f35e405efbc SHA-1: 95fdff47a64cf0c124917c76c22f20bffe5397a0 SHA-256: c5c5e1ce74b6daac1c1666353d21b4d0637741bd472a84ad9f008d2ca61340c4
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • 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://dafemum.ru/strik?utm_term=how+to+replace+kenmore+sewing+machine+belt PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407729/normal_60545a61cfb3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414866/normal_5fe1f6e6287eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5ffdf65d58dc1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426543/normal_5ff9b99ca2ebd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402261/normal_60097e1a5f92d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482617/normal_6061854e17355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479237/normal_603ae64f2c46f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454172/normal_602ce79d470e6.pdfIn PDF document text
    • http://rarebuzoxexovom.22web.org/compound_sentences_worksheet_4th_grade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446633/normal_6042f8c2ba6a3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475194/normal_5fe3e019cd333.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_602ce18322cef.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9971a7aa-dd77-4455-a2a8-80d65368889c/sex_and_the_city_2_movie_imdb.pdfIn PDF document text
    • https://43081b45-6e48-4b43-b724-9328fda377ae.filesusr.com/ugd/26481d_0119a2f6ffd94711917bb70a639b039f.pdf?index=trueIn PDF document text
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_e883364c9aa34c1db805705f6a056545.pdf?index=trueIn PDF document text
    • https://a72b158e-cead-41d6-a0b3-8518216316a4.filesusr.com/ugd/35c6e2_33d1e6f952d54105b987b179f3ac1ae8.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_963fd4c261e54bc5902ac83754b60008.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ba2f9ae-1ca7-4308-ba51-cd612cafc1c2/66152637624.pdfIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_fa94b774e3a54730b3e9b90de71b5dc4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c972b2e2-8673-4468-b725-ef37bdb0cbe9/zibutuxegogozilimisojelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8da28ca0-46e4-45c0-8121-5a2c2b80615c/zodinalusamen.pdfIn PDF document text
    • http://gikunipif.epizy.com/zamajumimagizuditokuzaxu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b85d4be-8d50-4a1e-b6b6-bb83cc12ec3f/piano_adventures_level_1_theory_answers.pdfIn PDF document text
    • http://kuxomexepus.epizy.com/xorebuwiwabesodopezik.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF664 5604 bytes
SHA-256: 03e6e87f46579886e8cac3725c0842661cd7b55c21745b05c00ffdd4d48db7f7
font_01_sfnt_off00010954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10954 10300 bytes
SHA-256: d4fee236b9456810eba807f0f41f37c2661a9de665393ab24dda96c2bcdd7610