Malicious PDF — malware analysis report

Static analysis result for SHA-256 3945b7c6634a816b…

MALICIOUS

PDF

89.6 KB Created: 2021-05-14 10:41:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: bbd52b3d63be0792b05e1ba2dde2f116 SHA-1: e376f11bbdbc3c45faeb18bbc72c86ae111f1f83 SHA-256: 3945b7c6634a816b510c9a4499e93739a30afe901c8421ee182519d519e59470
226 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body is obfuscated but contains references to 'john the ripper windows 10', likely a lure. The presence of ClamAV detection and ML classification as malicious, along with the 'SE_PASSWORD_ARCHIVE_LURE' heuristic, indicates a high likelihood of malicious intent, possibly to trick users into downloading password-protected archives or navigating to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://druttle.ru/strik?utm_term=how+to+use+john+the+ripper+windows+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449417/normal_603a82023a039.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_604fb92ec9a0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414688/normal_603a82eeaa578.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446289/normal_6003299f17f9a.pdfIn PDF document text
    • http://wurenuzuludesu.22web.org/kujozisirubirifiw.pdfIn PDF document text
    • http://visionnew.xyz/64767802892a6mzj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_606a5cf2edcc7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380876/normal_5fcca00e270ad.pdfIn PDF document text
    • http://2022god.com/aprenda_ingles_escuchando_leccion_28y803.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_60286d87d4309.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427809/normal_5fca1fe8725e7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://logururud.epizy.com/khatu_shyam_bhajan_video_free.pdfIn PDF document text
    • https://7054f9d6-44ea-4b6c-8535-0d04e7cb9957.filesusr.com/ugd/963b03_5eb11e3a06a143bd9c1115b5da9a2eeb.pdf?index=trueIn PDF document text
    • https://6b21c484-99f8-4e97-b77a-b77c054bfe5d.filesusr.com/ugd/f139d4_1493ee5d4f2246b8a1e807eb06c2d28d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b06fe891-8a72-4535-891d-680ba5faa781/miberujabejusuru.pdfIn PDF document text
    • http://nutukame.rf.gd/gamumaj.pdfIn PDF document text
    • https://03ca3561-abfe-48ca-9b59-b1b2b77f8126.filesusr.com/ugd/1af49e_13e02e3d8ce846fea06253db6b91d876.pdf?index=trueIn PDF document text
    • http://zofutigo.epizy.com/booklet_style_format.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8961a5fb-467d-4523-873b-510d9c929839/70492968687.pdfIn PDF document text
    • https://72b50e20-f79f-40ca-96b4-24bef83e308f.filesusr.com/ugd/1a1092_73f55fcbf19f476d9c228f87dec07548.pdf?index=trueIn PDF document text
    • http://dowovefedomo.epizy.com/18505941691.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 8884 bytes
SHA-256: 8c08c4ebfcebc97d670b3d95ccf273570151467bd6e9d18f482fd7bee60c66ec
font_01_sfnt_off0001127e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127E 5012 bytes
SHA-256: 7f3d0e061f160d02b8beede2bef725d1c1011422e781442a67212688eb3a7193
font_02_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 10868 bytes
SHA-256: aca492ac3a9aa91b0f41051248b33a55934a03e4104895f2644b9c687af16cd3
font_03_sfnt_off000148c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148C2 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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