Malicious PDF — malware analysis report

Static analysis result for SHA-256 21f4a32a836b679d…

MALICIOUS

PDF

75.9 KB Created: 2021-04-11 13:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 199cc64db27bc1156b8976d85fefa1da SHA-1: 29fc576a3df11789ebcaf097a6014d50d80091fc SHA-256: 21f4a32a836b679d040da9b2c667ca814e83240e5d0010aa7ff010922954805b
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 leads to a suspicious domain, likely intended to host a malicious payload or phishing page. The document body, though heavily obfuscated, appears to contain technical terms, suggesting a lure to trick users into clicking the malicious link.

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://jottigo.ru/strik?utm_term=what+is+tcp+ip+layer+model PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4458633/normal_6008c880404cd.pdfIn PDF document text
    • https://cdn.sqhk.co/menodotitit/cuviQru/bass_booster_for_tube_pro_apk_download.pdfIn PDF document text
    • http://jijoxep.getenjoyment.net/esl_appearance_worksheet.pdfIn PDF document text
    • http://mugukix.mygamesonline.org/delito_de_blanqueo_de_capitales.pdfIn PDF document text
    • https://cdn.sqhk.co/jarixizotib/hihe0ic/likee_video_status_new.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456134/normal_5fd05a3887058.pdfIn PDF document text
    • https://cdn.sqhk.co/tutadazi/ieJujhS/vumokezis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468255/normal_601a6680af1ca.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/6dd3de27-5422-42d2-bdac-675a1c29b2a8/calories_in_taco_bell_hard_taco_fresco_style.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/659d7a0a-22c1-4e05-8330-f4f5e4bc12b6/apple_ipod_shuffle_2gb_4th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a343c797-ddb3-431b-9ef2-cb41d77f363e/57890786046.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/75136010771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4e5585d-e1c2-4307-b2ad-73d3ce9c02d3/taurus_pt111_g2_holster_bass_pro_shop.pdfIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/fix_paper_jam_brother_printer_hl_2170w.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90c34388-8946-47d2-bb64-6b227c23ff9a/how_to_do_vision_field_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26c8b127-c1f9-4f01-a418-28aae3651e5d/83684782200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3a3fb88-d0b4-4a45-868d-bad596743cb7/27078404280.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_off0000ec7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7E 5428 bytes
SHA-256: b0c81a435ccbe3b0b89e1ae4d914380f205bff7041788f2cfd390be2c54718c2
font_01_sfnt_off0000fed8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFED8 10512 bytes
SHA-256: c65f17da0d8393b7049888ebdf44a83f24dd62ad5084e51a58cab5944b68bd43

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