Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef6e30c18a0e35fe…

MALICIOUS

PDF

76.4 KB Created: 2021-03-23 13:13:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2082af26644e3bf4dcbcfd23f3848531 SHA-1: 5560dea435c2fa39438b74f9d7fa7ed2a846fe89 SHA-256: ef6e30c18a0e35fe89c4d3595359ba64fe467e10c71f964435bd6f552f6c7b91
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://baarspo.ru/award?keyword=utilitarianism+theory+pdf PDF link annotation
    • http://viriruxik.22web.org/look_down_les_miserables_sheet_music.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372982/normal_5fcea69bbe890.pdfIn PDF document text
    • http://vovality.club/27373703973oyrie.pdfIn PDF document text
    • http://fortuneo-enligne.com/sitozobakefazovebuke1ougd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491433/normal_5fef61a0d95fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425919/normal_5fcf17bad4b94.pdfIn PDF document text
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/gafabete.pdfIn PDF document text
    • https://xefikusog.weebly.com/uploads/1/3/5/3/135390274/1884499.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484624/normal_5ff7bd05b2722.pdfIn PDF document text
    • https://bifupepazabar.weebly.com/uploads/1/3/4/7/134740405/zefaberapu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://judewal.rf.gd/gepagajaxagutinedugin.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_d6c2516c6a454fbca1f61e8cd004cd3f.pdf?index=trueIn PDF document text
    • http://wuzuvulas.epizy.com/heterogeneous_catalytic_hydrogenation.pdfIn PDF document text
    • http://guwavamo.rf.gd/ios_12_for_iphone_7_plus.pdfIn PDF document text
    • https://ac734925-007a-49fa-9a6b-2340142042ec.filesusr.com/ugd/ea78e0_cb56540e791640f6a6419ae168a935b9.pdf?index=trueIn PDF document text
    • https://c1bbde11-5cda-4f7c-8b74-b2fe90b484f5.filesusr.com/ugd/1c8c6c_e21fc9e2e1f04bc2afbb4471e2cdac92.pdf?index=trueIn PDF document text
    • https://6f672a44-e16c-4921-a0f1-e3781c0647c5.filesusr.com/ugd/bda22a_04d55530af93478782c895329161421e.pdf?index=trueIn PDF document text
    • https://09235f31-469a-4613-94fc-36d04c1f642a.filesusr.com/ugd/8b6407_68ebb7b5b3454c418200aa1c3b5b4d34.pdf?index=trueIn PDF document text
    • http://mosupixozijet.epizy.com/dstv_explora_installation_guide.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_off0000ef40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF40 5376 bytes
SHA-256: b26c29ac42a3bf5ec262447cfce381d83348bc175b77c661f236711928fc1fde
font_01_sfnt_off0001016b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016B 10384 bytes
SHA-256: 4b95c9e45be7dc5d82ef5b24c10d16cad4e5fa4280b1c3c7f5070c61d85ce70c

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