Malicious PDF — malware analysis report

Static analysis result for SHA-256 ede9990f3522566b…

MALICIOUS

PDF

76.7 KB Created: 2021-03-20 13:27:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 9c912cedd84715b1c6110885f94f5470 SHA-1: 0ab1cc65288cabbc0c8cce3fc5f938f503d8183e SHA-256: ede9990f3522566b765474cc97956eea03e277d140f3d2332626876f2aa07188
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristic PDF_SEO_LINK_FARM indicates the document contains a mass of external links, with one prominent URL pointing to 'kuzutuzo.ru'. This suggests the document's primary purpose is to redirect users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/strik?utm_term=where+do+our+fears+come+from PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4496225/normal_600d712129d4f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488090/normal_5fcdd04c06c15.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383170/normal_6025752f605a8.pdfIn PDF document text
    • https://tupivoxutod.weebly.com/uploads/1/3/4/4/134467409/899bce3bd.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/738499.pdfIn PDF document text
    • https://jogojirodatu.weebly.com/uploads/1/3/4/3/134321770/729e8e3abeba.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/40a6d13d-12cb-4e1f-9c12-8d82f48201e9/votibixodekotalerulaji.pdfIn PDF document text
    • https://s3.amazonaws.com/zidenigad/acr_forms_for_non_gazetted_officers_rajasthan.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/91165667931.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/chief_guide_meaning_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4ada9d-abce-483c-b398-23dd6d680e3b/67067894460.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/98cce7ba-df22-48f7-a0e0-522f19adc660/how_to_purchase_money_market_fund.pdfIn PDF document text
    • https://s3.amazonaws.com/bivanud/programmable_logic_controllers_5th_edition_petruzella_solutions_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nabifovu/kifekalorepel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25e8f570-4f8d-4315-8c78-d69269b0b5bf/dulememigowemegow.pdfIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/wowan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5412a38c-e70c-4d2e-92d6-b04ce69ee539/kafevitidetekaxovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82a2a058-52fc-4618-af8c-74f6f39a53ba/accurate_1680_load_data_300_blackout.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9218bcc-4bcb-4972-b97b-9e45b3e8b3e3/26505735821.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95abbbb5-50a6-4ac9-95c0-c390300d3ada/what_is_the_job_description_of_computer_hardware_engineers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/352e94b5-7cf7-487c-88e2-53b7e9208280/luwavax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f82d407a-c450-4807-80f7-0411d8403495/what_is_a_personal_statement_for_grad_school.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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 5244 bytes
SHA-256: a74a442ab02df6af8cca2ef7985cbd764b6f15eb773373eba5bd8f3d86ff1aef
font_01_sfnt_off0000feb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEB5 11348 bytes
SHA-256: 942baae3f2625637e29221d94eeee3f4690c3040d1ee0c73995637543e6dd5ab

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