Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7e5c2332cdbab4…

MALICIOUS

PDF

114.5 KB Created: 2020-11-11 06:39:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: de494eb38cb8299ee1b6d7c3dab7bc59 SHA-1: 1c3fe07dcd16121a3203edc11166c48f0fcfc88c SHA-256: cb7e5c2332cdbab47b8586ad06e3b27e53f9c750887acf09a094f517f5a79e2b
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic indicating an external URI, which points to a URL that mimics a search result for popular anime content. This URL is likely used to redirect the user to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent, classifying it as phishing and a trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/123?keyword=my+hero+academia+season+1+ep+16+funimation PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4391037/normal_5f8dea08176af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459175/normal_5fa8bbd262597.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/1e0ade6b-73a7-445e-9795-b9b90b5c1c9b/11192348888.pdfIn PDF document text
    • https://s3.amazonaws.com/fasanag/aprendizaje_autonomo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42a53278-40c6-4d49-8d97-867c1b516f88/jilezapejagabitegu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d960644-ef20-40ca-b03a-bd74cec28c19/linksys_ea_6200_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23166e80-7f9f-4fa5-8a90-ebfa93e07157/cannot_save.pdfIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/gesobuzepilalan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da051750-bab0-46c0-92e7-0580dabaf8a5/dubupepaxazesoze.pdfIn PDF document text
    • https://s3.amazonaws.com/fenatagazise/bugudumafixemozoranire.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2dc25ba3-3b3b-4784-b6c4-70be1d15939a/g12t-75_with_vintage_30.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/50278576367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a936e8e-467f-4256-af9e-2e2c2c2e2ff7/88480086652.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00011a0f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11A0F 21084 bytes
SHA-256: 5350afa3b1d063abfcc383dbccc884e488794cd8f858155e6d572dc15b5e7c91
font_01_sfnt_off00015d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D56 5676 bytes
SHA-256: ad585d3f6e81a6c1356da008d8e7b8adbc09ced54f3342c84bde1f6baf569214
font_02_sfnt_off0001708a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1708A 2744 bytes
SHA-256: c58734b7c43f876d00250fe79027c28030c899bcb97b97a165465ed91b27eb93
font_03_sfnt_off00017c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C34 12376 bytes
SHA-256: 72fbdc419ef154b0e3568ec2dbe1ce3775664a4ab5275492b9b678f0d2137a6a
font_04_sfnt_off0001a4f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F4 16616 bytes
SHA-256: 7ab81ce3d92a9ec80982bbbf7df4378fdf9290867a146be245f32411f9d17586

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