Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb348ec4c4a275ec…

MALICIOUS

PDF

70.1 KB Created: 2021-03-14 05:31:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac11dcc1988258063992a7d3f01833b3 SHA-1: 1c28ef5ca0c3fccdb343c549478f3bf92ecc19ef SHA-256: eb348ec4c4a275ec3f39dc73fcd33ad645332301784ecfcca1074abfb18a956b
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 0.9997

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://zajinet.ru/wix?keyword=u+of+m+gopher+wrestling+schedule PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fcb02d71df02.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385197/normal_6014bc0ada8b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447252/normal_6046f70555bbc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373526/normal_5fdbe8c467e48.pdfIn PDF document text
    • https://cdn.sqhk.co/wimebizag/hL0iaif/commoncoresheets_rounding_decimals.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_600b14c00a11a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476122/normal_604d5f338786e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_604ad94fb56bd.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/O0hamje/57755231194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444657/normal_5fdc21a73e5cc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387421/normal_600f9418e559e.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/BZjfNgf/formula_atlantic_4age_sound.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_70f7ec1f01a64886b42578623408dcfd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/fogas.pdfIn PDF document text
    • http://jipowefata.epizy.com/87199998304.pdfIn PDF document text
    • https://s3.amazonaws.com/vonusirukete/88602570685.pdfIn PDF document text
    • http://rezopokus.epizy.com/pakuliwujurinu.pdfIn PDF document text
    • https://5d94d51b-2702-4b64-8df3-eadd022f3edc.filesusr.com/ugd/2ddd39_e18deb8eace847df9c29bb2388a6f156.pdf?index=trueIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_14d1dee614f44cbab9bbd6474ec5c2de.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jevedijadiki/wedekujeboxa.pdfIn PDF document text
    • https://858e1da1-ad31-4e5b-aec0-89c59c6c71f6.filesusr.com/ugd/6240f8_0db930343cd24712adcbaf1d0e5b6c30.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EE 5440 bytes
SHA-256: 1a5e464b28e55bfe36f1d8738cba92991ecce654098974b93d0f41b4b91191a1
font_01_sfnt_off0000e767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE767 10420 bytes
SHA-256: 4ca1af207ea4fb9dede32acf98a74edfa3854f7f954ae536960c4e1b4bec88e5

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