Malicious PDF — malware analysis report

Static analysis result for SHA-256 d236a053123ba92d…

MALICIOUS

PDF

52.6 KB Created: 2020-11-08 01:44:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 30b4532fa657b5a75ca7cf38956e5a76 SHA-1: dab27a15601940b54238f5019042ac5b94362a07 SHA-256: d236a053123ba92d338be0c4d639afa475cf516af705b6c2f78ae10c98e976f1
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 1.0000

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://traffking.ru/123?keyword=bsa+wilderness+survival+worksheet PDF link annotation
    • https://solujokorox.weebly.com/uploads/1/3/4/1/134108712/8f123a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365638/normal_5fa5613a29ea1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381531/normal_5f8c5871b5d77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384628/normal_5fa686a44ebb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392651/normal_5f907049286ab.pdfIn PDF document text
    • https://nunavupogo.weebly.com/uploads/1/3/4/4/134471291/2541343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473651/normal_5fa7254ac5679.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421461/normal_5f9726751f6a3.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/sojebelevenex/uncle_montague_s_tales_of_terror_download.pdfIn PDF document text
    • https://direfaxa.files.wordpress.com/2020/11/44616410186.pdfIn PDF document text
    • https://s3.amazonaws.com/voxulija/78350260107.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/zepefefugurawibofupifemu.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/isosceles_equilateral_triangle_worksheet.pdfIn PDF document text
    • https://xanafegeze.files.wordpress.com/2020/11/tuzurizufozim.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/black_art_amiri_baraka.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DED 5060 bytes
SHA-256: 6370911c0633bd56c1ae84220cef352cb567212dab40828f7b0ddff4f57a8fc6
font_01_sfnt_off00008f21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F21 11532 bytes
SHA-256: cdbc9e9d08651c44f8db8f05cacd2638f6056457e1785ec4b406231c0105c347
font_02_sfnt_off0000b5fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FB 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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