Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e15d92472e0b1…

MALICIOUS

PDF

79.9 KB Created: 2021-06-11 05:18:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: aad172b6c40ea1ccda74e76150aa0a35 SHA-1: 1e50f21576bf693a6aba839062423f8f16c3b763 SHA-256: 4a1e15d92472e0b18ab015031ee2fc375251dc12fbc5b7057dbf0defd1777dd9
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://queure.ru/pbw?utm_term=matlab+license+key+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4382423/normal_5fdd7d140c681.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503279/normal_601e96c68f404.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426425/normal_603951e863a7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383806/normal_600ee1633ac3d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_6017cb093e422.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446398/normal_5ff381afd5f8d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401723/normal_605189ab132a3.pdfIn PDF document text
    • https://bapumuper.weebly.com/uploads/1/3/1/1/131164114/5361380.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460968/normal_5fd6791c3c1df.pdfIn PDF document text
    • https://jawonuvanez.weebly.com/uploads/1/3/6/0/136021807/fetug-pakituvakozopox-jujejejeni.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447912/normal_60379f78e5979.pdfIn PDF document text
    • https://zojajodasu.weebly.com/uploads/1/3/4/3/134354616/911c28b6ab4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417140/normal_6037958f5106f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vadibun.pbworks.com/w/file/fetch/144874107/free_vpn__security_unblock_proxy_snap_master_vpn_mod_apk.pdfIn PDF document text
    • http://veniwusuj.pbworks.com/w/file/fetch/144580707/nidowimezapukonedovix.pdfIn PDF document text
    • http://kikipudojuzo.pbworks.com/w/file/fetch/144529494/ecuaciones_diferenciales_homogeneas_con_coeficientes_constantes_casos.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/61864183663.pdfIn PDF document text
    • http://rapigidezuw.pbworks.com/f/pidob.pdfIn PDF document text
    • http://wojipag.pbworks.com/w/file/fetch/144745482/13526856347.pdfIn PDF document text
    • http://jabevexizoj.pbworks.com/f/56942524256.pdfIn PDF document text
    • http://wixumip.pbworks.com/f/befaledowesuponimesi.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_off0000fa14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA14 5184 bytes
SHA-256: 83754fed57989dbb9e6a4f4a2ddf1f16eda7e18d6a889660c5ee00c6b9829e2f
font_01_sfnt_off00010be0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE0 11292 bytes
SHA-256: 0a314896769ad162a745de3e28e4b079d9f57ff18d000d01fc247883a8e5c928

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