Malicious PDF — malware analysis report

Static analysis result for SHA-256 e39836ff0c03a950…

MALICIOUS

PDF

77.3 KB Created: 2021-02-23 23:06:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4055564825b69ae2f387968cc1eb31d5 SHA-1: de4f58125d96bbc8bd668363f9b4893e423c27d4 SHA-256: e39836ff0c03a950fb0e07c8c224a894caa4d7c0ffb61e06bb05b1a90c00de9a
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URI pointing to 'jacksth.ru', which is likely a phishing or malware distribution domain. The document body, though heavily obfuscated, suggests a lure related to fitness, a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/strik?utm_term=can+i+build+muscle+on+a+vegetarian+diet PDF link annotation
    • http://betmoy56.com/rulezelavu7cmsj.pdfIn PDF document text
    • http://santecmb-sarl.com/math_textbook_grade_2i2v6o.pdfIn PDF document text
    • http://mosdendy.store/simcity_4_mac_download_free_full_versionlfzst.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475854/normal_5fff00553485c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486975/normal_5ff21d7ccb811.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/savogozugaj_gikidel_faguvexuzimow.pdfIn PDF document text
    • http://znakomstva69.space/free_prezi_templates_technologyhn9uc.pdfIn PDF document text
    • http://interstart.online/free_fruity_loops_12_download_full_versionbmobv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375525/normal_5fc8266729d79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416493/normal_601f46094696f.pdfIn PDF document text
    • https://wipomozexabezi.weebly.com/uploads/1/3/0/7/130776841/08b94e4c065298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388839/normal_6025bd6a9ca56.pdfIn PDF document text
    • http://italystore.pro/how_to_draw_flow_chart_in_word_2007pv9gh.pdfIn PDF document text
    • https://bunosepe.weebly.com/uploads/1/3/1/3/131379858/7220339.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/gomakobez/paint_brush_photoshop_software_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/92606748107.pdfIn PDF document text
    • https://s3.amazonaws.com/lopeteb/15740083899.pdfIn PDF document text
    • https://s3.amazonaws.com/kujesulad/android_sqlite_database_crud_example.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_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 5364 bytes
SHA-256: d637c76559ebb56f8294d1dd1bc98e2053612e29a3c7f4774a99a89113c08bcd
font_01_sfnt_off000103d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D3 10412 bytes
SHA-256: c6265210df26c8de76862e80d80b8f9ba7ab78620fcd04c9697c972da1d446e3

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