Malicious PDF — malware analysis report

Static analysis result for SHA-256 c778fd1487ebf9e0…

MALICIOUS

PDF

77.0 KB Created: 2021-04-09 08:58:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 659853ba157b65096e5269f7637d8c5e SHA-1: 27014e149e883801c0c3bc79a533077c23269f66 SHA-256: c778fd1487ebf9e09fd366474997fd1572e6d096089ff379770f01eb0eaab855
136 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier and ClamAV as malicious. It displays a fake CAPTCHA or human verification prompt, a common social engineering tactic to lure users into executing further malicious actions. The embedded URL points to a suspicious domain, likely serving as a distribution point for a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • 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+to+write+on+verification+of+property+condition PDF link annotation
    • http://nowatora.22web.org/employees_provident_fund_organisation_forms.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_6019bc668eb7b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465024/normal_5ff934d576c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415783/normal_5fe6463652967.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374360/normal_60017810d9786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386094/normal_5ffd3bff9a924.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495409/normal_603a47ff4ee28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377663/normal_60215d550a9ec.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/votawawo/36477121665.pdfIn PDF document text
    • https://s3.amazonaws.com/vizegemawokaxe/97261719112.pdfIn PDF document text
    • http://bibarixe.epizy.com/english_present_tenses_exercises.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/consumer_reports_best_cars_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/rawuni.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/15906022179.pdfIn PDF document text
    • http://jipaxesu.rf.gd/data_studio_csv.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_off0000e0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B4 5088 bytes
SHA-256: 0b83704640741205c16414d41618508d94590c5f9a46c8109b7876f4527f5abf
font_01_sfnt_off0000f21c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF21C 10592 bytes
SHA-256: d722a60e31ef11aae89e2303c94f96d526691cdd3b59259fbf7aa778ac37c0df
font_02_sfnt_off00011646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11646 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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