Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b43139f28a0532…

MALICIOUS

PDF

84.0 KB Created: 2021-03-22 05:38:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f9d8c2f52282ec08c30eec176fc3762d SHA-1: 97976711d46566239828474f8b97622b1c75cc30 SHA-256: b5b43139f28a05326c802a78e73075d46e902bb6c2c422b2d38dc1fded963b32
96 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 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 4

  • 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://midufefew.ru/wix?keyword=buddhism+and+hinduism+activity+worksheet PDF link annotation
    • https://fosevikotik.weebly.com/uploads/1/3/1/6/131637163/papofigubovijukiret.pdfIn PDF document text
    • https://xelusivixofon.weebly.com/uploads/1/3/5/9/135958974/927a987.pdfIn PDF document text
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/b2af59c8.pdfIn PDF document text
    • https://joginogi.weebly.com/uploads/1/3/1/1/131163620/gipev.pdfIn PDF document text
    • https://lekifusa.weebly.com/uploads/1/3/1/3/131382118/3987a7d53769ad.pdfIn PDF document text
    • https://demagariku.weebly.com/uploads/1/3/4/3/134374203/kowabunuliwawivifuri.pdfIn PDF document text
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/4067867.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/vebenok/pajunenaxuwononitorarupog.pdfIn PDF document text
    • https://s3.amazonaws.com/visagogijulep/xamedibidupafukenukubeg.pdfIn PDF document text
    • https://s3.amazonaws.com/megulu/pathetique_sonata_sheet_music_imslp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ba178b-ca70-4da3-bfbb-bd01af3d9a9d/64313606396.pdfIn PDF document text
    • https://s3.amazonaws.com/xeruxaxer/47788083148.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/sandeep_garg_accountancy_class_11_solutions.pdfIn PDF document text
    • https://s3.amazonaws.com/kalanejaxutilif/69738866719.pdfIn PDF document text
    • https://s3.amazonaws.com/legesiliv/phoebe_brother_girlfriends_guide_to_divorce.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/054a9417-e13a-4e12-91df-ac3db0282a65/lugagekavi.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/23363674723.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/zawedigofuvuvod.pdfIn PDF document text
    • https://s3.amazonaws.com/sagotomagin/tijogefotugejaf.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/sibof.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/angry_emoji_pic.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 5512 bytes
SHA-256: b100f75012a00b358797d3564f7f99719bd7ad58c47549a3f096fe0613bb5102
font_01_sfnt_off00010636.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10636 11080 bytes
SHA-256: c8328838fa3915ad6b874d48cb102caaae96e6d97c8608432fb305be8fc13a71
font_02_sfnt_off00012c1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16232 bytes
SHA-256: f260341e2deafef282c0cdf6f9547f7c1575836931e00f2cecf0e77490754097

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