Malicious PDF — malware analysis report

Static analysis result for SHA-256 15c3ae1ba1576307…

MALICIOUS

PDF

68.2 KB Created: 2021-02-22 00:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c6c88c603ada5ce5c55f57d3fbe3d653 SHA-1: de4179b51dc4e2ddac6518b9be99260880a2c6e3 SHA-256: 15c3ae1ba1576307d53d9f92194ffb01e76e65a3fe33ce0b1324d37ec4d16580
66 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and is flagged by heuristics as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier strongly suggests maliciousness. While no scripts were directly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://jottigo.ru/strik?utm_term=calculadora+casio+fx-cg20+manual PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482020/normal_5fca8a698f35a.pdfIn PDF document text
    • http://idealica-uficiale.website/536382288238j5g4.pdfIn PDF document text
    • http://meetsucre.pro/been_together_apk_pure2ciln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384026/normal_5fed95e133a32.pdfIn PDF document text
    • http://lg-copyrightforms.com/610576930557erem.pdfIn PDF document text
    • http://werenntaq.online/datepulifixofototasisom9osw4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483833/normal_6029ada16973f.pdfIn PDF document text
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/dafovozekupufefibi.pdfIn PDF document text
    • http://siteznakomstv69.space/fujisivaby97rq.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480412/normal_60215e3860bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369663/normal_6022bfe8117d7.pdfIn PDF document text
    • https://gideturifit.weebly.com/uploads/1/3/4/8/134887905/resefepafawijo.pdfIn PDF document text
    • http://avlto.best/self_evaluation_answers_communicationp30zm.pdfIn PDF document text
    • http://keto-menu.online/confederation_of_british_industry_annual_report_2018z8ma8.pdfIn PDF document text
    • https://nezovudaposuru.weebly.com/uploads/1/3/0/9/130969726/lolazujopaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476567/normal_5fed37ca1d921.pdfIn PDF document text
    • https://fusufuxono.weebly.com/uploads/1/3/1/6/131606103/79278.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/kuxegu/tevijefamemiti.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/cosmetology_exam_secrets_study_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/at_t_u_verse_dvr.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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 5620 bytes
SHA-256: 0856fae1ae35dd4ea0c0fae20aa9dbbdfed024fbae508a5c23601381dbb651a9
font_01_sfnt_off0000dfbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 10700 bytes
SHA-256: 4f8ae0991a2c5a9b20a34dd11b2330310a29f753845730bc92c18a26e54eb2f9

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