Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e4c161d6af686ee…

MALICIOUS

PDF

75.8 KB Created: 2021-03-25 01:59:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ef033b6b68d72497e397ea1721a9ffd9 SHA-1: c930f3897a314d4954b2b2d9fdec14618354b210 SHA-256: 9e4c161d6af686ee9b4ac0962fad19007da85ab40ce934139ceb26be2850f8b9
156 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 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://nipisod.ru/strik?utm_term=whirlpool+gold+accubake+gas+stove+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4370540/normal_6018e49f838fc.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/fevamopukemex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479441/normal_5fef1183255fa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447916/normal_5fcad07ac5641.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403822/normal_5feff1746ef5d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449965/normal_60004435a691f.pdfIn PDF document text
    • http://vataponuxizeliz.mywebcommunity.org/52377680040.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/free_1st_grade_printable_math_sheets.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405904/normal_5fd81f8777684.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474462/normal_5fcf0ae0e2909.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/internal_control_audit_report.pdfIn PDF document text
    • https://ebd157e6-94c3-4ff5-b3ab-516f87acbde6.filesusr.com/ugd/e87473_c070b8ce70804c0280c4130e4b2d5e16.pdf?index=trueIn PDF document text
    • https://05b7586d-5a24-4234-b982-0130f9e02105.filesusr.com/ugd/2f8cea_018a46f6367e4129927f8d2cb78ad33e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tigovatolis/critical_ops_apk_mod_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/tumasun/odia_song_2018_video.pdfIn PDF document text
    • https://17851959-1482-4b49-8222-7b7b0c628459.filesusr.com/ugd/3cb679_a3034876ab484bc3af2e79d565afd3e8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lowuwofuxali/sazexuwasinemajo.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/wivepaxajadepoke.pdfIn PDF document text
    • https://0f0532cb-4478-41f9-91a1-cf277c4732ec.filesusr.com/ugd/8acad3_cc9e8dd0fccc465aba6832c4f99d3420.pdf?index=trueIn 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e96a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE96A 5764 bytes
SHA-256: f2a1c67407f257919d87b2be46ddd40ce3961e948fc073b097b5ff0430832e8e
font_01_sfnt_off0000fced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCED 11052 bytes
SHA-256: 3839e7ef4b64cb68ac06a0570eee1df9721dfe6d29e10f04ce830ad279f180fd

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