Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e4df5d8f91bdfc…

MALICIOUS

PDF

78.7 KB Created: 2021-05-29 02:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: fe9966832ea472c65321ca33c48d7597 SHA-1: 10bc273a014658cc5bd4cd5508acc6e4f31e8772 SHA-256: d5e4df5d8f91bdfc13e99da449ee17a93688c89d045e60110cc2ce62b82796f1
186 Risk Score

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 0.9991

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://baarspo.ru/strik?utm_term=how+to+determine+r+or+s+from+newman+projection PDF link annotation
    • https://sewusadata.weebly.com/uploads/1/3/5/4/135401056/temimeninisawomo.pdfIn PDF document text
    • https://senevabitup.weebly.com/uploads/1/3/4/2/134234896/dadosove.pdfIn PDF document text
    • https://xakediripikevul.weebly.com/uploads/1/3/4/3/134338645/wakonenukixuvuzodow.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5fc7a9e656b4d.pdfIn PDF document text
    • https://puxokobipo.weebly.com/uploads/1/3/4/5/134524361/6955555.pdfIn PDF document text
    • https://jedujidiki.weebly.com/uploads/1/3/4/3/134352610/9e30e.pdfIn PDF document text
    • https://vusesuke.weebly.com/uploads/1/3/4/7/134723580/1953338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454665/normal_5fee37a629102.pdfIn PDF document text
    • https://xunowivoratidom.weebly.com/uploads/1/3/1/6/131636824/rapij.pdfIn PDF document text
    • https://lozofuxoxezutuw.weebly.com/uploads/1/3/5/3/135303337/xeposulavogus.pdfIn PDF document text
    • https://visumosibe.weebly.com/uploads/1/3/0/8/130814065/a3e7b14.pdfIn PDF document text
    • https://nipodixosun.weebly.com/uploads/1/3/4/4/134494364/9951183.pdfIn PDF document text
    • https://jawuwokobot.weebly.com/uploads/1/3/1/3/131381435/6410688.pdfIn PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/wonas_mejamejuvaperid_wowekegadisowuf.pdfIn PDF document text
    • https://dumexegutotopu.weebly.com/uploads/1/3/4/3/134354144/6025883.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481059/normal_60232f98db43c.pdfIn PDF document text
    • https://pajuxosam.weebly.com/uploads/1/3/0/9/130968950/508b6d5ce71a.pdfIn PDF document text
    • https://simokodopegaliw.weebly.com/uploads/1/3/0/7/130776428/xetukabelidubukum.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372373/normal_5fde2f1066462.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6040f49bb3e23.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4714288-d1b6-4ea6-bd72-1ce1be1a8cd3/caracteristicas_de_la_investigacion_exploratoria.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f56d8334-33c1-41ef-8da5-50654ab5cd3d/vewiroz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d2dc68f-8b07-4aa4-9f48-b35ac62ae134/what_is_the_best_arena_2_deck_in_clash_royale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34064b44-8a5a-48f6-8a79-152a65e1d975/what_is_childe_harolds_pilgrimage_about.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_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 5400 bytes
SHA-256: 25c21e7d25457115f3f1edf8e5a1b6cfcf1049d250e935293b824306957a5aa9
font_01_sfnt_off0001046f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046F 11376 bytes
SHA-256: 57263513c3232de4c35ce47d3606ef53d805849f485f27ee64fe3cdf1b02779b