Malicious PDF — malware analysis report

Static analysis result for SHA-256 db5485cdea994542…

MALICIOUS

PDF

71.4 KB Created: 2021-01-09 00:22:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 9bfee05252ff1227300515a59d84092a SHA-1: e8291c1f35d65cd5ad29a0c987ac093010129a1f SHA-256: db5485cdea994542a8f7e844c3e6adb76531473ae50246bf81295ea1897a7080
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains an embedded URI pointing to 'https://trafftec.ru/123?utm_term=world+history+study+guide', which is likely used to deliver a secondary payload or redirect the user to a phishing site. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of external URLs and the malware detection strongly suggest a malicious intent.

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://trafftec.ru/123?utm_term=world+history+study+guide PDF link annotation
    • https://cdn.sqhk.co/vujagefamig/2qcn6wH/58521089728.pdfIn PDF document text
    • https://cdn.sqhk.co/jujegopenop/OhaIuW6/up_first_podcast_spotify.pdfIn PDF document text
    • https://cdn.sqhk.co/soxoxefumuv/jdojhgi/20490488410.pdfIn PDF document text
    • https://cdn.sqhk.co/pubodegosog/ubNt6gf/video_downloader_apk_mod.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447662/normal_5fee0c0baa324.pdfIn PDF document text
    • https://cdn.sqhk.co/giganopof/jijLhfx/hustle_castle_guide_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pasepizut/XIHdPp4/minecraft_earth_map_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/jadepibake/mxpfjcC/airtel_digital_tv_my_plan_219_channel_list.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/xifabilejilab/rubuzezipok.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/abberancy_regular_font_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bodajaku/wakot.pdfIn PDF document text
    • https://s3.amazonaws.com/ratixifo/sage_300_accpac.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/36484632010.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49d531b3-4e98-468a-a8ae-3cf373d4fc02/pitching_charts.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_off0000dd67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD67 4992 bytes
SHA-256: 55b4d9374afd43eb5290da37644f9d0732a5fcbb7513a8bbf496b2ba02311eaf
font_01_sfnt_off0000ee6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6B 10112 bytes
SHA-256: a116bc039b6ecece851d4793546fb57f8348bfbad673e5d60320a4ae82166009

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