Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7441cf8c11a86c…

MALICIOUS

PDF

80.6 KB Created: 2021-04-03 05:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: dec59f5d35009b91577ce6ea6123508f SHA-1: c77ac1c5c2de198c09402b1b5bc8ad04ab9e776a SHA-256: fb7441cf8c11a86c686128b20cad8462cbdca48657910be41923ec7cbb204c03
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a PDF link farm, suggesting a tactic to manipulate search engine results or redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the extensive linking pattern is the primary indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/award?keyword=6th+grade+math+test+pdf PDF link annotation
    • https://bageribo.weebly.com/uploads/1/3/4/5/134592059/xaxobukijepo-dijolovapeji-denowuri-mupunexumalizu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463528/normal_60555594f379a.pdfIn PDF document text
    • https://rominovomi.weebly.com/uploads/1/3/4/0/134041030/df90e.pdfIn PDF document text
    • https://pobanuritixejun.weebly.com/uploads/1/3/4/6/134601578/defcf26dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481064/normal_5fec4e7e6cd8e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495696/normal_60217a357221d.pdfIn PDF document text
    • https://rogapunuki.weebly.com/uploads/1/3/4/3/134375427/b8bbe054adc669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387031/normal_6029267305fef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_5ff70c6998c35.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/lixuzo/minority_report_film_imdb.pdfIn PDF document text
    • https://7e70056c-c2aa-4e53-98c5-50750123c107.filesusr.com/ugd/f8ae5d_d05352186e0f40f587b62e1476521dff.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/registration_form_using_ajax_php_mysql.pdfIn PDF document text
    • https://s3.amazonaws.com/murudute/blackberry_all_mobile_ringtone.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/broadsheet_adelaide_best_bars.pdfIn PDF document text
    • https://3c3713de-992c-4571-92b4-00afcb8cb2c1.filesusr.com/ugd/9dbdb2_2ff417fe25ad44dab9b9bec827ab2770.pdf?index=trueIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_c42791562b5742a0b65f980a665c3d1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ganubatebedoxez/are_court_cases_italicized_in_mla.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/web_browser_video_er_ios.pdfIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_9041b4c87db4413f88e8e8e719430762.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/arignar_anna_books_free.pdfIn PDF document text
    • https://s3.amazonaws.com/fifuto/data_analysis_tools_and_techniques_ppt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DF 5008 bytes
SHA-256: 36b49fe9a65f38b912e564f0828936dcae2bd1072a5511da6a3d11403c104b5b
font_01_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 10792 bytes
SHA-256: 70635995dab04204bb4188a45371c3cc1fef5085132db329a032f546c9b73a7c
font_02_sfnt_off000126ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126ED 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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