Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1bdb951256a25d4…

MALICIOUS

PDF

78.0 KB Created: 2021-02-23 12:18:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0587dcc644ad9f925b2cb27de54622e0 SHA-1: 1681181ae7cdefffab235836d2ee93c4c0a3527d SHA-256: f1bdb951256a25d4c9431d73ad0fed73fc22b3be1f7499ca549ccf4d0ff8c8f4
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9998

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://baarspo.ru/wix?keyword=centers+of+triangles+worksheet+answer PDF link annotation
    • https://cdn.sqhk.co/tosilura/emOjcie/free_casino_games_no_registration_or_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456999/normal_5fe10f20edb98.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454306/normal_5ffda235867d5.pdfIn PDF document text
    • https://kitejunozog.weebly.com/uploads/1/3/4/3/134319277/nelewodinin.pdfIn PDF document text
    • https://cdn.sqhk.co/zeterabaxax/egjih5s/sledziona_totalna_biologia.pdfIn PDF document text
    • https://fubuwadedaxas.weebly.com/uploads/1/3/4/8/134897716/xojupifuxibawar.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424029/normal_6008f99805163.pdfIn PDF document text
    • http://rarurude.22web.org/anna_university_inplant_training_report_format.pdfIn PDF document text
    • https://zuwogirunuwexi.weebly.com/uploads/1/3/5/3/135331524/siwoperebaxabut.pdfIn PDF document text
    • http://pepujolajerikur.66ghz.com/chopsticks_easy_piano_music_sheet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473971/normal_5fcfb3909e41a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382186/normal_5fe3546f9b74d.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/tuzakifezara/22902756974.pdfIn PDF document text
    • http://xupasafagimi.rf.gd/voluntary_manslaughter_sentencing_guidelines_missouri.pdfIn PDF document text
    • https://s3.amazonaws.com/nutanigonu/what_is_knowledge_representation_using_propositional_logic.pdfIn PDF document text
    • http://degepedafapuf.epizy.com/biennial_update_report_pib.pdfIn PDF document text
    • http://bolopanezodubun.rf.gd/dodokevojejiveburoseb.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/australian_super_balanced_performance_2019.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AD 5092 bytes
SHA-256: 010c63a70b1eddc73b8498b08d41850c1cbc22082f420d54a07653560f90077f
font_01_sfnt_off0000f801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF801 3940 bytes
SHA-256: 2092d174cc2bef6b6a327dfb40e22eb60944abaf8c8379bb4b2d48b9f7921af8
font_02_sfnt_off000106b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B3 10256 bytes
SHA-256: e96b5cb74561ae04a074a3585b7e7c66bfb4068446d93f61079479a6c906c4d8

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