Malicious PDF — malware analysis report

Static analysis result for SHA-256 281683f1e700a2bb…

MALICIOUS

PDF

75.4 KB Created: 2021-02-19 18:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8c6007bcda15a2283f2a77a2feb943fe SHA-1: 27cc6eb6eb790a615bbd07f6ec1ba667dad5adb0 SHA-256: 281683f1e700a2bbf31ec63153af1c61b3e4bfa9e0ac114120db64e404ba56e0
96 Risk Score

Malware Insights

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

The file is a PDF document detected as malicious by ClamAV and an ML classifier. It contains an embedded URI pointing to 'https://jacksth.ru/wix?keyword=weather+or+whether+worksheet', which is likely used to redirect the user to a phishing or malware distribution site. The document body is heavily obfuscated, but the presence of the external URI and the malware detection strongly suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/wix?keyword=weather+or+whether+worksheet
    • https://cdn.sqhk.co/jemitaso/ijidpib/guardian_tales_lazy_fairy_comics_locations.pdf
    • https://cdn.sqhk.co/velizovatim/j1jjXE7/sisters_oregon_weather_hourly.pdf
    • http://tegor.xyz/56868849586tf948.pdf
    • https://cdn-cms.f-static.net/uploads/4416149/normal_6015ffb2dea17.pdf
    • https://cdn.sqhk.co/gidagolusi/5yiiahc/vojabomafefuz.pdf
    • http://zespodsvetkoy.site/happy_new_year_song_video_2019ssgla.pdf
    • https://cdn.sqhk.co/motuwezelu/j4hfphe/life_expectancy_medieval_japan.pdf
    • https://static.s123-cdn-static.com/uploads/4369659/normal_5fe20924a43b1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://s3.amazonaws.com/retisovojor/77477983688.pdf
    • https://s3.amazonaws.com/jeponowon/22342536489.pdf
    • https://s3.amazonaws.com/bupaxomu/55952345574.pdf
    • https://s3.amazonaws.com/kewuxejikiwe/bekigarapimufaxilaj.pdf
    • http://warodisomadux.epizy.com/free_experienced_resume_templates.pdf
    • http://dulubuli.rf.gd/lightroom_free_app.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d651.bin
f770471345631c1a08500fcc3c6b70ec2bebcd3578008fe170fefa04ee065053		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD651 4912 bytes
font_01_sfnt_off0000e70a.bin
c529723fd3101f742ad4d6fb2fb9e31a1e59c5fc62b8360d6e53c5b86e641857		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE70A 7660 bytes
font_02_sfnt_off0000fc3b.bin
ffdc73591749e013fc233ab9df16a5395f761927a998a8315a5ad11578a49ad8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC3B 10396 bytes

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