Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcbee229e86799d…

MALICIOUS

PDF

69.4 KB Created: 2021-03-28 04:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a3f3240b77edb7e06decda1dbbeb0921 SHA-1: eb0ba98e3ef4597fca71e1b114a98381a7e3ac64 SHA-256: 1dcbee229e86799de8bbbf1cab13388917bb144467abaded57dbcd3b13b7f234
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 0.9998

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://jacksth.ru/award?keyword=assessing+reading+by+j+charles+alderson+pdf PDF link annotation
    • https://cdn.sqhk.co/gidulikegel/7KGibjc/bugsy_movie_trailer.pdfIn PDF document text
    • https://cdn.sqhk.co/gilubibawi/gjUhi9M/mitomozoxesepopik.pdfIn PDF document text
    • http://maxitis.22web.org/give_off_crossword_answer.pdfIn PDF document text
    • https://cdn.sqhk.co/jotapepikota/niIfhaA/12121290705.pdfIn PDF document text
    • https://cdn.sqhk.co/digiwejasipu/jijia5s/42024001695.pdfIn PDF document text
    • https://cdn.sqhk.co/getabemuto/kkdjd2X/equalizer_cast_alina.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://s3.amazonaws.com/sugowubuf/netacad_python_answers.pdfIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3e2250f9655344b8b4295e0382ba4f2b.pdf?index=trueIn PDF document text
    • http://lonozixugixapap.epizy.com/6780721973.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a82906ee-0bdc-435e-9ea2-57efc261ca12/95448149727.pdfIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/marugujarat_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/84811716252.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1485fe4-71ea-4215-aa14-964e16932394/5226766189.pdfIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_8bf5ee8433c54ec3b7e8338f3839f4c9.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC473 5432 bytes
SHA-256: 71fd1e03406ca202af0b1c0926ff6d88a643b9103a07b6f26ab27c0760195c17
font_01_sfnt_off0000d6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DB 10536 bytes
SHA-256: b3c67195f1db83974e75aa7def60f0cc02e1096f32ac5ae4ac6b4b40a2d8bae5
font_02_sfnt_off0000fa84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA84 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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