Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c71f9b8d270447b…

MALICIOUS

PDF

82.0 KB Created: 2021-03-11 00:23:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2c8db8e48a4561b804dff957757639b7 SHA-1: 1669b377155da9e7a11e5c0e62e256aa742872de SHA-256: 1c71f9b8d270447be81da8bd3c3d74fc6a5d637224f33a4a3868e75c27c69abd
156 Risk Score

Malware Insights

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

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 0.9997

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 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.
  • 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://kuzutuzo.ru/award?keyword=beethoven+sonata+5+piano+pdf PDF link annotation
    • http://rankingcoach-apps.com/best_ponniyin_selvan_bookbhkxj.pdfIn PDF document text
    • http://sereluxulu.iblogger.org/87758327898.pdfIn PDF document text
    • http://vawuxipofuf.iblogger.org/axial_yeti_jr_review.pdfIn PDF document text
    • https://zabugejagovim.weebly.com/uploads/1/3/1/6/131637755/6910398.pdfIn PDF document text
    • https://zubikazosiz.weebly.com/uploads/1/3/4/7/134761183/patot.pdfIn PDF document text
    • http://euroshopmn.space/92028304159uofbb.pdfIn PDF document text
    • http://wisajekunitope.22web.org/lg_tromm_washing_machine_error_code_pf.pdfIn PDF document text
    • https://pigiburoletu.weebly.com/uploads/1/3/2/6/132695467/kager.pdfIn PDF document text
    • http://bumaga.bz/great_bustard_bird_informationcq5i8.pdfIn PDF document text
    • http://repair-kompov.ru/386305180656oaq4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zibenoroduzuw/89572937889.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/tisumig.pdfIn PDF document text
    • https://s3.amazonaws.com/xuzed/brother_mfc_j835dw_printing_blank_pages.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/how_to_write_an_argumentative_essay_fast.pdfIn PDF document text
    • http://bologipegokofi.epizy.com/42557858965.pdfIn PDF document text
    • https://s3.amazonaws.com/suzixegazunow/shein_bikini_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/fractions_word_problems_worksheets.pdfIn PDF document text
    • https://13fad4bf-7224-44b3-802b-16842e97d241.filesusr.com/ugd/b14664_35919f3179144fb0b0e48532df774a49.pdf?index=trueIn PDF document text
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_665b8fd0bce94050a1fac7899a018905.pdf?index=trueIn PDF document text
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_5d4390d85f83423eb9e4ee563fa7bc1e.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 5024 bytes
SHA-256: a70aaf7e1b4e72ed6b71445526373faef160c25c8f35c322e739b7235c7a1542
font_01_sfnt_off00010a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2F 10120 bytes
SHA-256: f5b2e8cb40b6d2328e5b59bb1a810fc42f3bab92815acaa6a0e597d579527959
font_02_sfnt_off00012ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CCD 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

Open this report in the interactive analyzer, or submit your own file for analysis.