Malicious PDF — malware analysis report

Static analysis result for SHA-256 a40b84b835dd6efa…

MALICIOUS

PDF

73.6 KB Created: 2020-12-31 14:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0254f5c41fb254fb927165b4e9bbb33e SHA-1: b85897e97c7d7b47c65d388225c094d093c68d08 SHA-256: a40b84b835dd6efafe09be4dc79b3daadd5b8d772d9e6c33fa03f74c7254983d
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one leading to a known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to photography tags, likely to entice users to click on the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation for client execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/strik?utm_term=best+instagram+tags+for+landscape+photography In PDF document text
    • https://xevosafodom.weebly.com/uploads/1/3/4/7/134739965/95e63986.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/mewesan.pdfIn PDF document text
    • https://cdn.sqhk.co/joduragenep/ibdihih/microsoft_sharepoint_designer_2016_64_bit_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/goviwigax/english_language_dj_video_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/16018185677.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/dubusanipipoxigegojigol.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/sanford_and_son_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8fbf9dac-0981-4369-88a4-0dd38a264a2b/restitution_de_connaissance_svt_1ere_s_tectonique_des_plaques.pdfIn PDF document text
    • https://s3.amazonaws.com/zeworibuzoza/aws_cloud_practitioner_exam_dumps.pdfIn PDF document text
    • https://s3.amazonaws.com/votuweroxigezog/architectural_drafting_using_autocad.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_off0000e180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE180 5720 bytes
SHA-256: ec8e98274f4d05692c246816887b154e31d096a1e865588813c0f24f43b3f3b2
font_01_sfnt_off0000f4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D8 10768 bytes
SHA-256: bbec6f435a5869a48d952f5f119af903882eef5e4f5658df7cf77dffb5b6b4a3

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