Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bdab7d5d50f1600…

MALICIOUS

PDF

69.4 KB Created: 2020-11-19 00:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 27b084be268e978bd50e80c59ae2f24b SHA-1: d3c9a54bada3d7a1b17725151ed59a3aa57aff22 SHA-256: 5bdab7d5d50f160005201be86a96b581fb0809049aaf4e9d9d87d55b120d9762
222 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of embedded URLs and the ClamAV detection suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • 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
  • 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://gettraff.ru/strik?utm_term=addtype+application%252F+octet-+stream.+pdf In PDF document text
    • https://nukubutoti.weebly.com/uploads/1/3/2/3/132302768/7308174.pdfIn PDF document text
    • https://bapoxaluw.weebly.com/uploads/1/3/4/7/134717037/3af0492767d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424646/normal_5f97a725e3310.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/6c9591b9-f52c-44ac-9808-6c8601960ede/bigabajokomufetefekogup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66b898fb-5734-4087-83bd-2c113fd4de0b/43486176954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ee0a9ba-4998-44d2-9b43-dde75b61c304/69263833012.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ab79515-0a39-4cfe-acbf-10d71cdfc975/30910171660.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af1f5105-0db2-410d-9c6a-9b70823e8735/euskera_ahalera_ariketak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7eb0b4-8aba-45fd-972d-059f368a0e91/bubbleupnp_pro_apk_3.2.3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ec22f9f-dc62-46db-8de1-f1ee788abb57/wulitikirafetituvudipot.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/cost_accounting_notes_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2ce17a4-65cc-4a1a-8ac3-cc035e4d997e/new_english_sex_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ad14a63-42d8-416c-bbf5-2e9bb73dad3a/powokuruxoripomugavifureb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/694f53c4-ec28-4555-ab12-95614059a9cc/65187184498.pdfIn PDF document text
    • https://s3.amazonaws.com/bidivo/feature_article_ideas_for_kids.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_off0000c7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7DA 5492 bytes
SHA-256: 2944d7ea9d8cc269f418ee884cc51bfbbf9ab0ad233f54e7cd6bfb8fc49732a3
font_01_sfnt_off0000da92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA92 14512 bytes
SHA-256: 06d1c167327b437efdfa5ccfe7820f4fcb2a8b7e6a5cfb9ff61be61b23ce4cbd

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