Malicious PDF — malware analysis report

Static analysis result for SHA-256 775bb6489d8c2b0c…

MALICIOUS

PDF

76.9 KB Created: 2021-03-30 14:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bac0aa49bd4e8d03e0b16ca2014b0347 SHA-1: 6c3fd750fc2a9527472c96e4d06addd149275e9a SHA-256: 775bb6489d8c2b0c5089a8e948102b4458cce99ce53c4df1a4dc4224fa943050
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://seumenha.ru/wix?keyword=costume+design+worksheet+middle+school PDF link annotation
    • http://dorightunion.com/adjective_comparative_superlative_worksheetm1t0l.pdfIn PDF document text
    • http://nigavereke.mygamesonline.org/44014920869.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408323/normal_5fe24de21ea2b.pdfIn PDF document text
    • http://dfahsdfgjsfg.online/40846113283qts9e.pdfIn PDF document text
    • http://sayseedokg.com/tozadivuwadavh9azw.pdfIn PDF document text
    • http://stroymarketmetal.ru/how_to_use_the_perfect_cooker_for_rice3vgxr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470689/normal_60559c77a7b16.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/kuxuxemu/astral_chronicles_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/fadupazageraf/xiwabesatemaziwu.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/background_editing_photos_hd.pdfIn PDF document text
    • https://394fded3-a37f-45fe-8092-07e0884d2d31.filesusr.com/ugd/bdbc91_50f12c1a533b4af5a447db6b748e76ed.pdf?index=trueIn PDF document text
    • https://ed36ca5d-e6e9-4caf-8bbb-3a8af5cfee16.filesusr.com/ugd/971556_3274795af75f4059bbc4d994afc1ebbc.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pavujiniz/blasterjaxx_gasolina_bootleg.pdfIn PDF document text
    • https://s3.amazonaws.com/pozokimepe/9412014908.pdfIn PDF document text
    • http://zakefuki.myartsonline.com/labadigatelepitilibofi.pdfIn PDF document text
    • https://69a21580-3c80-4f81-8097-1ec0bc18215d.filesusr.com/ugd/bd7df1_27bbdd8dffa449d39185422ea3dc8ece.pdf?index=trueIn PDF document text
    • https://b3d988c2-7a7d-4c3c-9141-221b6550481e.filesusr.com/ugd/9dda13_c3130e263fe344e7ba066ad8727a148f.pdf?index=trueIn 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_off0000ee7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7C 5204 bytes
SHA-256: 70cb98c298c0aa2c49a664b419da1cc7fe2eb259a29049146dce3a463f0d6d33
font_01_sfnt_off00010018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10018 11228 bytes
SHA-256: 9ef7b41f334a28c29d20a44366e3256d049c47a515e62740eae665f8e21e331f

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