Malicious PDF — malware analysis report

Static analysis result for SHA-256 21393264ba1d5045…

MALICIOUS

PDF

74.3 KB Created: 2021-06-03 02:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 112b9bc82963a5fd6acb538e8c1c3eb1 SHA-1: ca04ef6d0b865d50c83db6242b2bbe583ff77029 SHA-256: 21393264ba1d5045460876018e99a5ff1aff01211677135082db4108b8aa2864
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 5

  • 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.
  • 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://medvor.ru/pbw?utm_term=insan%25C4%25B1n+anlam+aray%25C4%25B1%25C5%259F%25C4%25B1+pdf+indir PDF link annotation
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/da852.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_5fe83d9a3fc5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481406/normal_600b15810c96d.pdfIn PDF document text
    • https://minawitagolufu.weebly.com/uploads/1/3/5/3/135312922/4548299.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/53028f07-c2d2-4884-b918-e5c79540e9e1/780886855.pdfIn PDF document text
    • http://tujelupirobe.pbworks.com/w/file/fetch/144494427/too_much_too_many_enough_exercise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7a481e4-6f5a-4724-b7fa-dd7c2ef16b05/nelson_math_textbook_grade_7_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/168a72ba-8d94-47f2-9e07-0428095d2fb9/what_is_fourier_equation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26cf412e-93c7-449d-9867-a936fb236997/ratujetigizoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/914df5a4-3dd8-4270-b1da-9e5b15858fd8/crown_manual_pallet_jack_parts_diagram.pdfIn PDF document text
    • http://dibesusajob.pbworks.com/f/soxizuzewekotesulonajesar.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144413940/nonudemom.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144535191/saxefogedorijib.pdfIn PDF document text
    • http://wigiwopajuke.pbworks.com/f/bidajime.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/148b8d94-2bd6-4f1e-acf3-c14ac286da36/we_were_liars_reddit.pdfIn PDF document text
    • http://xetibubib.pbworks.com/f/pipe_fitters_math_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d59f67-c522-457d-b40f-9b5cc117a802/11702035746.pdfIn PDF document text
    • http://wekibivu.pbworks.com/w/file/fetch/144470139/dojiwixirikojekozib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9057d796-b569-4af3-97e8-fea6cf2b3d77/how_to_read_korean_symbols.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CA 5504 bytes
SHA-256: c5ccfa6c1bb9ba909a5acf53c2a18b4b58824dade0a725a37e9f72eb38ae1b95
font_01_sfnt_off0000f2f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F6 12352 bytes
SHA-256: 1d63a6ed7a336d319c3f529236a6863ccc3fde1c93770a314bef91aeefc6f654

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