Malicious PDF — malware analysis report

Static analysis result for SHA-256 593527aaf7c2bd6e…

MALICIOUS

PDF

65.1 KB Created: 2021-03-24 13:46:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ded6e750d3446fd5e5deb496c06efc79 SHA-1: e0628b7a299fb996b46be6a40270075d596ed456 SHA-256: 593527aaf7c2bd6e0ad17aad2da685c3f29ceb7c9b65cacd5e7a098875850e97
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/123?utm_term=cfe+exam+prep+course+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454280/normal_602713b0d4587.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477401/normal_603e8752b6cbd.pdfIn PDF document text
    • http://guzoseta.getenjoyment.net/jurnal_mengenai_akuntansi_biaya.pdfIn PDF document text
    • https://wutusexiradolo.weebly.com/uploads/1/3/0/9/130969471/2270265.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/arihdgh/vertigo_exercises_treatment_video.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/ddjjgcU/21401495291.pdfIn PDF document text
    • http://tegotapiw.scienceontheweb.net/2498838228.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_6053aaf97b776.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370055/normal_5fd7a10a02ebb.pdfIn PDF document text
    • https://vetepoxep.weebly.com/uploads/1/3/5/3/135302771/nevigu.pdfIn PDF document text
    • https://tofibuji.weebly.com/uploads/1/3/5/3/135309424/wawuwonaretev-vigon.pdfIn PDF document text
    • https://ruwagifixub.weebly.com/uploads/1/3/4/0/134013037/3492282.pdfIn PDF document text
    • https://vexibalob.weebly.com/uploads/1/3/4/8/134896466/3d6078e4280.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417306/normal_5fd79d07ba123.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417309/normal_603226d96ef92.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000c01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC01A 5244 bytes
SHA-256: b28bac6c0c80e92179372fa0afe200bee3651e0647f86aadd316bd67180d5503
font_01_sfnt_off0000d1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D9 10568 bytes
SHA-256: 61bad828b073af25f6945e794140c64f07d0fc42526ab430f9d5cf7f41ac38de

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