Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e8d530bc1100b9d…

MALICIOUS

PDF

60.9 KB Created: 2020-12-17 00:23:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 10b0fbdae62385fef75ddf4006b42dba SHA-1: bf2d07c6d19bb624e15ea4569efed8fccad5a29f SHA-256: 4e8d530bc1100b9d4fc284c19e94ee19f893d3b2b91f58b3204427c9e1b92352
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs with numeric slugs, indicative of a link farm or SEO spam tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution via these external sites. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • 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://traffnew.ru/123?utm_term=rogawski+calculus+4th+edition+pdf+reddit PDF link annotation
    • https://vejikawotepux.weebly.com/uploads/1/3/4/8/134887167/jeviboreretu-jodewa-wagefasobakonif.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/ac7da4449.pdfIn PDF document text
    • https://nipufijupetobug.weebly.com/uploads/1/3/1/4/131482996/a8fbe82199ad.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/gidijak_fasuwemuzutap_movodupow_fewav.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/9cd85.pdfIn PDF document text
    • https://bepupoxusiboma.weebly.com/uploads/1/3/4/8/134847186/115487c.pdfIn PDF document text
    • https://xawavefite.weebly.com/uploads/1/3/4/6/134667803/7f05e0d7f63f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0fbb61c8c741314323605/t/5fc33763a97599144e608978/1606629221115/renagebatunaxaberavuvizu.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc542159955c744b5580f48/t/5fc779c92ac13f1ee9bca555/1606908362076/space_agency_2138_apk_1._0._5_download.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc55ba5239b0722914ef72f/t/5fc66b3b9d79364840698c9c/1606839102486/48199739992.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4c503485235c86bcb387/1606372434297/74025234011.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd04b273299f0c543ae065/1606223033935/40654145758.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e325d157-fa40-4700-aa6c-b31a0e8bdfed/vodizuvokogip.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_off0000afec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFEC 5668 bytes
SHA-256: ad0f546a9d78d3920db76978a187173fd4d4b5ad909733635ea5ce3977f2a5a5
font_01_sfnt_off0000c35f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC35F 10412 bytes
SHA-256: 55df8d2cf28a100a7eba7127be300cd5e49c923a47257e1cdd2cf65f88205460

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