Malicious PDF — malware analysis report

Static analysis result for SHA-256 1043d57ad268c5c1…

MALICIOUS

PDF

76.5 KB Created: 2021-02-08 18:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: d5e5dffc0c3df3faa8c5305112ea2b2c SHA-1: 3b3cbf30b3dafecb149b13f881d09fead272261d SHA-256: 1043d57ad268c5c1e1ea77ba204d88ca9c46b6b9c9c9d9441f6783946efe7011
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was flagged by a machine learning classifier and ClamAV as malicious, with specific heuristics indicating it presents a fake CAPTCHA to deceive the user. An embedded URI points to a suspicious domain, suggesting a download or redirection attempt. While no scripts were directly extracted, the nature of the fake CAPTCHA and the presence of external URLs indicate an attempt to execute further malicious actions, likely involving a second-stage download.

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/aws?utm_term=naruto+shippuden+ninja+storm+4+apk PDF link annotation
    • http://nisisigewu.iblogger.org/online_free_car_racing_games_for_android.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495400/normal_6007ff8f50e93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417313/normal_5fcd338ef0f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461481/normal_5fc8109ed19ff.pdfIn PDF document text
    • https://cdn.sqhk.co/ributexovek/id1phj6/fedopugobapufipa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476596/normal_5fca3caf7161f.pdfIn PDF document text
    • https://cdn.sqhk.co/fegozanodedu/3jghfhW/one_clue_crossword_fish_harvest.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/EjfggZr/best_craft_beer_delivery_app.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
    • https://s3.amazonaws.com/fedufiporara/95224209810.pdfIn PDF document text
    • http://zerekigukazaja.epizy.com/passport_renewal_form_bd.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/mecanismo_de_accion_de_anticoagulantes_orales.pdfIn PDF document text
    • http://laletanegimiw.epizy.com/graphs_of_functions_worksheet.pdfIn PDF document text
    • http://zufisad.rf.gd/whatsapp_blank_white_screen_android.pdfIn PDF document text
    • https://s3.amazonaws.com/vufupu/4809985292.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/vided.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_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 5244 bytes
SHA-256: 5575667a7d397b52e742f315ab02e2ed4e6b6e0f810a07d9aea809d366df1162
font_01_sfnt_off0000f2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2EC 10496 bytes
SHA-256: e6eca573619f50e9e85310ff59cab09ac1f47a4a60426f7ab0b4078725dce0c8
font_02_sfnt_off000116e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116E3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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