Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6cd855e26d13897…

MALICIOUS

PDF

76.8 KB Created: 2020-12-30 23:18:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8a223608e4536bff9c54ab026be54279 SHA-1: 71f4d98354b286b33b437cdd7551d35f05b9dd1a SHA-256: d6cd855e26d138979d6a7292d874365215fe81c7bee3a1ea2b6175c09e1cb8af
254 Risk Score

Malware Insights

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

The file is a PDF containing embedded links, with one heuristic identifying it as a malicious redirector. Another heuristic indicates a 'ClickFix' social engineering attack, suggesting the document prompts the user to execute a command. The presence of numerous external PDF links and a high ML classifier score further support malicious intent, likely for phishing or malware distribution.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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://traffmen.ru/strik?utm_term=snes+controller+usb+driver+windows+10 In PDF document text
    • https://febapemideb.weebly.com/uploads/1/3/0/7/130738739/9fd5f62dc.pdfIn PDF document text
    • https://cdn.sqhk.co/vatuliwa/EVjdTge/20411886680.pdfIn PDF document text
    • https://dozasasakebo.weebly.com/uploads/1/3/1/1/131164234/jitewogoz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467318/normal_5fbced81c8bbc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476432/normal_5fca7787e61a9.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/YliddUX/52640812529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369518/normal_5fd6ecba98199.pdfIn PDF document text
    • https://cdn.sqhk.co/lanasido/K7ljb0r/nuzumu.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/d76c2363-e324-45ac-bd15-44325849b243/subplot_matlab_same_x_axis.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/mapa_de_puerto_rico_con_pueblos_para_colorear.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9069bb8a-ec3b-4028-bb0c-abcb8fbb9029/tv_series_quiz_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7660f7f6-dfaf-4315-b4f8-f53ed2ca9906/life_cycle_of_an_elephant_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3d12df4-5a3f-4046-8349-5c85f2f6c762/xedafawegilex.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/dijaredirur.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_off0000ea49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA49 5312 bytes
SHA-256: 47925a0eef1087235942c6c0c42c406eb6e86e27e16a13f0ab33930e7719a234
font_01_sfnt_off0000fc85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC85 11836 bytes
SHA-256: f08ef5c40e99029a8941845da751c5cae3a1b4acfe3cb637b5ef658fd2f6dadd

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