Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad9fafa15d3e0b1f…

MALICIOUS

PDF

78.3 KB Created: 2021-05-23 03:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 658a6d4983715ed78692076a8e69fdc7 SHA-1: aeb9e9bde500e4e7b79424f6268ad5ade15f1dcd SHA-256: ad9fafa15d3e0b1f1d31f8cd26716a48b78d3613b3f2db2b7fc6251c12aa3bd8
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to a suspicious domain, likely intended to host a phishing or malware delivery page. The document body, though heavily obfuscated, suggests a lure related to 'blood types and their characteristics', a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/strik?utm_term=blood+types+and+their+characteristics PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491925/normal_606c0354e9ef1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_600bc06573b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369502/normal_601b7c6ce7e62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368243/normal_5ffc5c50b28df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472491/normal_5fdc4176449c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459034/normal_600b1de21c8ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457582/normal_5ff4e244437fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485322/normal_5fd1cdfe51495.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464851/normal_606c6ec8e1e01.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381098/normal_5ff62ccce9906.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60392e5b961cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473654/normal_60183f37dda08.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/mikibetiv/6732336117.pdfIn PDF document text
    • https://s3.amazonaws.com/fatikonavori/advanced_dungeons_and_dragons_players_handbook_2nd_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/sizabo/23260778418.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/apache_tomcat_7_free_exe_file.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/wd_my_cloud_not_visible_on_network.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/cribsheet_by_emily_oster.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/wiwezedemeturufizegavugop.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_off0000f59e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59E 5312 bytes
SHA-256: eb224bcd5417f5813e31a9010d8b6ab510fd5b89be57b2557bc15dee3c8dc155
font_01_sfnt_off000107b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B1 10688 bytes
SHA-256: b554a851a1ae467c0b229b4ace29b6e35dbfc4275f2c183e8c194d053ecd14bc

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