Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b66f0ff17392aa…

MALICIOUS

PDF

97.6 KB Created: 2021-04-29 00:12:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cb70d326c0d4689c44bd334a2dc80514 SHA-1: 23e10997f7737c144eea7eeb08002bafa576b7a9 SHA-256: 24b66f0ff17392aa7be74114ef76c2ceb75288e3d936b142cd5b5a3b55913ae7
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to direct users to potentially malicious content. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/strik?utm_term=kung+fu+panda+2008+wiki PDF link annotation
    • https://cdn.sqhk.co/tenokesime/i8gclli/evil_cogs_game.pdfIn PDF document text
    • http://kavademive.sportsontheweb.net/block_abdominal_ultrasound_step_by_step.pdfIn PDF document text
    • https://cdn.sqhk.co/vunalogivefu/6jfidja/46916533905.pdfIn PDF document text
    • http://xifutipixa.mywebcommunity.org/couper_un_document_en_plusieurs.pdfIn PDF document text
    • https://kipokemob.weebly.com/uploads/1/3/0/7/130738996/firese.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_5fd2bf9e7b221.pdfIn PDF document text
    • https://vixugusimuxomuj.weebly.com/uploads/1/3/0/9/130969476/9971827.pdfIn PDF document text
    • https://lamipakowoj.weebly.com/uploads/1/3/2/8/132814468/0d3bdc7f9052d.pdfIn PDF document text
    • http://wojisub.mypressonline.com/introduction_to_automata_theory_languages_and_computation_solutions_for_chapter_5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502567/normal_60051aa3406db.pdfIn PDF document text
    • https://perelixaji.weebly.com/uploads/1/3/4/8/134881923/dcdcd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e0271a52-a7af-48e9-8a99-924ce320ec62.filesusr.com/ugd/be5703_a4ba9614cf1841c18f9bd73a70d18280.pdf?index=trueIn PDF document text
    • http://jugugesazo.myartsonline.com/86263721100.pdfIn PDF document text
    • http://xenezipulugiji.atwebpages.com/wordly_wise_3000_book_5_lesson_2_test.pdfIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_9a0125ad410148e2ac34290be8e40644.pdf?index=trueIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_4854cf15d1e94cafa17360cb1e3d8908.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_6488c0ea3a5f47408234ccf54a5f09df.pdf?index=trueIn PDF document text
    • https://87d5e434-dc39-4d64-8681-877d64e204d5.filesusr.com/ugd/5660ac_0ba0e1f6080f4eac9b1572235ec9a4c7.pdf?index=trueIn PDF document text
    • http://sasaxunofob.atwebpages.com/28793779180.pdfIn PDF document text
    • http://gifidabula.atwebpages.com/how_to_do_scoliosis_treatment_exercises.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_off00013e7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E7C 5496 bytes
SHA-256: 861c883a3eb429b87db6b2dca737f6739b71c5927860032730079507fa25e333
font_01_sfnt_off0001516f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1516F 11748 bytes
SHA-256: 5460e7290b5530853cc8cb4e941e51ad5e4dc5bd5b48151624c74aba5251fec5