Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c33fd61733e668…

MALICIOUS

PDF

69.1 KB Created: 2020-12-18 00:55:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1c515c759dfb17aade0bc1f77d35a886 SHA-1: 25bae30e53afaabda6c16e3862b4bfdc1718ea90 SHA-256: 61c33fd61733e668fc0971440708b3e2673ee3df6d64ac02196536aa946b7d04
66 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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafffe.ru/aws?utm_term=chhattisgarhi+gana+song+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4472783/normal_5fd38941ec8d9.pdfIn PDF document text
    • https://vurebinavusim.weebly.com/uploads/1/3/4/7/134714178/8a36dc6.pdfIn PDF document text
    • https://bivilasafufi.weebly.com/uploads/1/3/4/6/134689398/mudijatix_filajevum_mopebazixud_finaguresadoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501794/normal_5fcbbeb92021d.pdfIn PDF document text
    • https://fikosaxan.weebly.com/uploads/1/3/4/7/134753192/xotul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415543/normal_5f9d2475541f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409997/normal_5fc1c71a4e152.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/kedoxu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9efbea70-ad1a-45e2-8261-7de052a38db1/mebuwolanus.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc563906609fd0ee7af89e8/t/5fcacca708ddca70c7441820/1607126183423/stone_age_boy_book_cover.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fcdf33fe48d292cf0c8aadb/t/5fcf24ac01eaf4591e2361f0/1607410860761/gikusagizijadujimubonajo.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc53c1cf7cf8c7540473628/t/5fc84440ee804a17a1cb5840/1606960194498/jimuvozilibev.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_off0000d021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD021 5020 bytes
SHA-256: bd5bc78e83aada018a67a0fcd883d38c658c1acaa5025ed3fa7616befc67e637
font_01_sfnt_off0000e12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12F 11424 bytes
SHA-256: 4bbb9c07d5e845a561adda4916d60696e39368f8fb80de5142f2017375b92ac8

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