Malicious PDF — malware analysis report

Static analysis result for SHA-256 2542d9a985576c70…

MALICIOUS

PDF

76.8 KB Created: 2021-05-01 02:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8647ed6bd2416927c9abf24985e74839 SHA-1: 98779aac0767dca672f060d2495a85c4f7391520 SHA-256: 2542d9a985576c70a095a435c7a55e6b942c300e50ef386066c73df8996518be
186 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 ClamAV and 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 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=how+to+speed+up+apple+airport+extreme PDF link annotation
    • http://wipunemobak.mygamesonline.org/drums_of_autumn_book.pdfIn PDF document text
    • http://wudenufodoroziv.scienceontheweb.net/ada_2020_espaol_completo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404299/normal_602090e9dee8d.pdfIn PDF document text
    • http://habercigo.com/sibizulabumitemawotaf8ajp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369174/normal_5fc85f89bf05e.pdfIn PDF document text
    • http://maturibcgj.space/votovik2pk5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487918/normal_60314f39400e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422147/normal_600a7398058ea.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://44f68060-d5e3-4d58-b4e7-e3760392f352.filesusr.com/ugd/49488e_d31af60d30584af8a712bdd97bc796a3.pdf?index=trueIn PDF document text
    • https://52a72965-a6d2-471e-b66a-59a59a4d663b.filesusr.com/ugd/e643da_206783bb92fb4641b1aed5248fd7838c.pdf?index=trueIn PDF document text
    • https://d1ee23ee-9ccf-45b0-80ef-1e1ff1f657c4.filesusr.com/ugd/9ef0c3_659463a8c4e34e23bbb37711093af54f.pdf?index=trueIn PDF document text
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_d7f182ef575c4975b239fd8e4fa81ba5.pdf?index=trueIn PDF document text
    • https://66f9c2bc-82a6-463d-9ccd-9c94d3d8805e.filesusr.com/ugd/b361c6_e6710cdc10ac4c60afd32a4e7cccaec7.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_0b628d94af634ed7a0f87cdfa0d2170d.pdf?index=trueIn PDF document text
    • https://77a5c3e7-429a-4f60-ad30-886abaef4f6e.filesusr.com/ugd/07a1ab_871ca43026e04c26a53a6e942c34aa23.pdf?index=trueIn PDF document text
    • https://1261df91-4e32-40b2-8b8a-4050d3c54cbb.filesusr.com/ugd/df69c1_08461d14c63d4cd28f87d0e4d15e09d3.pdf?index=trueIn PDF document text
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_019b252ba04d44d88a08e6fb9b9459bf.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

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_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 5224 bytes
SHA-256: 1d90fa098acc86fa8141ae89baa25ef5f626791c0eedf7fd555ee099cd45c2d6
font_01_sfnt_off0000fbfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 11868 bytes
SHA-256: eaddbf9c7526f8725df2cd7830bb79d013106c49848cf986a0f8c5f9fc1b1d40

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