Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f1d5b59d8bb2224…

MALICIOUS

PDF

81.1 KB Created: 2021-03-09 00:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 2923a20333ca1de6f9959af8e9b988e9 SHA-1: 20107e9f5f42c074f51e5f8fd2a796fe9ed06acb SHA-256: 4f1d5b59d8bb22246fa0d7f61a9797b751ac062affaf1c5051ae7fae1cdd3ef9
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains an embedded URL that directs users to a suspicious domain, likely for further exploitation. The document body, though heavily obfuscated, suggests a lure related to 'Oedipus Rex critical analysis pdf'. No scripts were extracted, but the presence of external URIs and the ML detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=oedipus+rex+critical+analysis+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446398/normal_5fe9db7d53b74.pdfIn PDF document text
    • https://cdn.sqhk.co/zunesunatiri/gic1VrK/runijevozovirelifuwukis.pdfIn PDF document text
    • https://cdn.sqhk.co/nulusezitelo/hxhfuH2/torobinewulifawur.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498366/normal_5fec4db62b933.pdfIn PDF document text
    • http://rerulekoba.66ghz.com/what_was_the_impact_of_the_lincoln_douglas_debates.pdfIn PDF document text
    • https://cdn.sqhk.co/nezusoxe/cUajcji/febuzagim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413373/normal_602d9f0423558.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367304/normal_60383ae2d574c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450141/normal_5fd091b55e43c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366993/normal_600f0979e4997.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://kuzadimizu.epizy.com/depth_sensor_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kodipopujufipig/ridgeway_school_bus_information.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/visiting_card_templates_psd_free.pdfIn PDF document text
    • https://s3.amazonaws.com/mokuwanibof/delejewabiledipekevez.pdfIn PDF document text
    • http://fenulujexita.epizy.com/best_emotional_whatsapp_video_status.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/android_native_ads_in_recyclerview.pdfIn PDF document text
    • http://rixogapokat.epizy.com/sekevujama.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/lawiwuwifukugiwalolemebis.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 5120 bytes
SHA-256: 17255859afac3960e036db874a70c97bc2e6a78b2a251cab2e010eca5396bcb0
font_01_sfnt_off0001058b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1058B 10392 bytes
SHA-256: 5ae1c30998f000c91cb48edf38de021404571849b269ce94ecef4b2b64f08d36
font_02_sfnt_off000128f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128F0 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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