Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f602ac411bde317…

MALICIOUS

PDF

72.7 KB Created: 2021-03-17 22:47:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: f244d2c06a5af656ae6e178a1da78678 SHA-1: 540e70b13245fac3d51627c7ff42c789ef4e8b0b SHA-256: 4f602ac411bde317a4ea714286abbc6338e39e55fbcd9f52c3992a63bd38af54
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 0.9998

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://midufefew.ru/123?utm_term=kakuro+free+games PDF link annotation
    • http://hairsprof.ru/93265848346nxfuu.pdfIn PDF document text
    • http://sweetygirl.club/vinyl_express_lxi_expert_software_downloadtgv1b.pdfIn PDF document text
    • https://jamafijuzu.weebly.com/uploads/1/3/1/4/131437216/sokorekefifexo_luwedunowupifup.pdfIn PDF document text
    • http://bitjoms.xyz/macbeth_full_play_patrick_stewart8xkk1.pdfIn PDF document text
    • http://wimuzawoxi.getenjoyment.net/60788666159.pdfIn PDF document text
    • http://biwedujurar.mywebcommunity.org/java_beginner_to_advanced_tutorial.pdfIn PDF document text
    • https://ravuripuzi.weebly.com/uploads/1/3/5/9/135958818/dabopijenepolo_xenulikofopib.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/83302946105g67oc.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/savuriweloteku0rt.pdfIn PDF document text
    • http://strahauto.website/gizexadigufigenujaxeg77wym.pdfIn PDF document text
    • http://ligexekena.mywebcommunity.org/surufopi.pdfIn PDF document text
    • http://uscovidcharts.com/gamesaxegejegewuritrsrve.pdfIn PDF document text
    • http://fitokaps.xyz/google_assistant_apk_for_android_marshmallowh782b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://61090d85-22e6-4724-b969-52a17785150c.filesusr.com/ugd/952c2e_f9b1f4d581d74c23b2dcc0ad126150cd.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fazujo/file_path_traversal_cheat_sheet.pdfIn PDF document text
    • https://30621b86-6952-4b41-80af-4d24d830bc7c.filesusr.com/ugd/122077_0efb753126c4439088a4a6c109af75a7.pdf?index=trueIn PDF document text
    • https://0b670cc3-d94b-4117-8b98-7ce677fb6c21.filesusr.com/ugd/7bc559_c335e4cb83eb4cdebff0d2e13072ad65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/ruzaganog/navigateur_brave_android.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_off0000e128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE128 5088 bytes
SHA-256: fe88a01f47098c4d66edb0e76516c908907f0963ee6e5b5deda518cb7b0ee3da
font_01_sfnt_off0000f26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26C 10292 bytes
SHA-256: ee92a8f64202b0dc4b4489d41a902880e0b7af8e5f7b8440768cc1880f0da298

Open this report in the interactive analyzer, or submit your own file for analysis.