Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8436e4caf847e7e…

MALICIOUS

PDF

79.5 KB Created: 2021-04-03 07:47:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7eaee1f7566670e3c1db7986d53e75a0 SHA-1: e98db5dc73a00288eb672517b6fd8707ba8f89a5 SHA-256: c8436e4caf847e7ec9d2468f7062ddfd859bccb41b15917d2e2a3bce520fa93e
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 0.9996

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://zajinet.ru/123?utm_term=alka+seltzer+gas+stoichiometry+lab+answers PDF link annotation
    • https://zesalefol.weebly.com/uploads/1/3/5/9/135994098/tazepekuror.pdfIn PDF document text
    • https://fuxarudoniw.weebly.com/uploads/1/3/5/3/135350341/tilojajubidofa_duzolodoku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387713/normal_5fc6ba28bb94d.pdfIn PDF document text
    • https://fadafiwu.weebly.com/uploads/1/3/5/3/135302778/sodoxopiredu.pdfIn PDF document text
    • https://muxapikaw.weebly.com/uploads/1/3/5/3/135346573/vebevixoji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367680/normal_5ff3b9992761c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5fe458579cfa5.pdfIn PDF document text
    • https://kewivuzakokefi.weebly.com/uploads/1/3/0/7/130775129/guboliwoj_bosajugotiroluw_vesisovulem.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/betefowubevat/devurirogebelev.pdfIn PDF document text
    • https://s3.amazonaws.com/dorulusof/megunexumaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0686d406-7b9b-4a62-a302-ed20dd7bddfc/dbt_meaning_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/endangered_animals_printable_fact_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/bivamokifatoriraturox.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/aimersoft_drm_media_converter_crack_download.pdfIn PDF document text
    • https://s3.amazonaws.com/bejeseja/act_math_vocabulary_word_search_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/safety_data_sheet_required_sections.pdfIn PDF document text
    • https://s3.amazonaws.com/sevoga/5359195270.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11b2512c-e638-437d-9ab7-3acc3bc29cc0/tijewawiziriw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0beeba0a-0147-4da5-a20a-5faa10731fe9/ew_kenyon_two_kinds_of_righteousness.pdfIn PDF document text
    • https://s3.amazonaws.com/nalifij/wamanuwuxele.pdfIn PDF document text
    • https://s3.amazonaws.com/jasipefulaxiduj/canon_powershot_elph_160_manual_espaol.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_off0000f477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF477 5648 bytes
SHA-256: 5293e022c122fed878f5bc736e8c0f6b1bcf52bde778f46522ac64ab49d51106
font_01_sfnt_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 11564 bytes
SHA-256: a823c72e9f0bdc0ca43e27af5ad31a5d38910783d7cff4752b09db2888fa5208

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