Malicious PDF — malware analysis report

Static analysis result for SHA-256 f79596b90ed8928e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-05 13:34:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0a39e74f817aacb15f0bc565f18ff3d3 SHA-1: f986ec87fa3e4307a03a8679d1ed75b0cdb2dd50 SHA-256: f79596b90ed8928ea0335c332f667410b463d810f9951996300954045f4d5449
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, many of which appear to be disposable or used for SEO manipulation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a malicious document designed to lure users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://soxebez.ru/award?keyword=saxon+algebra+2+teacher+edition+pdf PDF link annotation
    • http://tonalemeketav.66ghz.com/46758490011.pdfIn PDF document text
    • http://trells.space/casio_amw320r_batteryqxadd.pdfIn PDF document text
    • http://copyright-central-media.com/fraction_decimal_percentage_conversion_tableb9v4d.pdfIn PDF document text
    • http://zitosobuzozuz.22web.org/70190447679.pdfIn PDF document text
    • http://wapazezaduv.iblogger.org/wekubudi.pdfIn PDF document text
    • http://anarchymedya.com/generac_22kw_installation_manualf1bqf.pdfIn PDF document text
    • http://kasyanbeauty.com/727985609750zsbx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465709/normal_6058313e90082.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366381/normal_5fefc86585e0e.pdfIn PDF document text
    • http://kinoxca.xyz/trump_tower_building_nycg97fp.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://uploads.strikinglycdn.com/files/4bb7af07-b83b-461e-956a-3246c2c76af4/songs_of_praise_christmas_carols_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e63aaa03-3bc6-4bf8-ad7e-6a6226a32a15/6785972097.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87bc5b86-0430-477c-9213-b06f0b06bb0a/3rd_grade_reading_book.pdfIn PDF document text
    • https://9334512a-4df1-45dc-8804-f0fa1d9e2a3d.filesusr.com/ugd/9466eb_6042d4d7026b40bbbbd1de134ec6e075.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/070423bc-69aa-439f-87e3-325cdc445192/the_columbia_anthology_of_modern_chinese_literature.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a1329c5-d6be-453e-9e39-06defe18f299/jinuvuruvivoketarifef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d4dcf3c-e950-491d-886c-a56beb064f09/orange_high_school_hillsborough_nc_football_schedule.pdfIn PDF document text
    • https://2ddf8be6-044d-4f30-b6fd-16c032829cd6.filesusr.com/ugd/9827ea_68e3af1b6e894da68da7bb4b375b3f5d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6677cf5-7617-41fa-8791-136e33e9c36f/3000_common_english_words_with_meaning_in_urdu.pdfIn PDF document text
    • http://segodasegig.rf.gd/livro_acgih_2020_portugues.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_off0000e5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C0 5472 bytes
SHA-256: dfe4e696707c6e2a9000df3517597b14703a7a8e53c33d1497282f27d41baee7
font_01_sfnt_off0000f845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 11020 bytes
SHA-256: 5d38b4ecf2ca0aa3e7521ca40c44a92b2eafef46152602f355707f76b024f3e0
font_02_sfnt_off00011dc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC4 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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