Malicious PDF — malware analysis report

Static analysis result for SHA-256 997bafa7fb27949c…

MALICIOUS

PDF

87.8 KB Created: 2021-06-03 12:39:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e20e779432674c39eeafc3ade0a8885f SHA-1: 690cdb18928f57f130e5f8b17d183ce9dc4fa0fd SHA-256: 997bafa7fb27949ce44593da4862c986168a9d1fcaa6cc0630fc1bc1bba7c375
96 Risk Score

Malware Insights

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

The file is a PDF document that contains an embedded URL pointing to a suspicious domain, identified as a phishing or malware distribution attempt by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to a 'cuboid example name'. The presence of embedded URLs and the high ML score indicate a malicious intent to redirect the user to a potentially harmful site.

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://nomylo.ru/pbw?utm_term=cuboid+example+name
    • https://zunoratev.weebly.com/uploads/1/3/5/3/135345657/7618013.pdf
    • https://durozuxazoxete.weebly.com/uploads/1/3/4/6/134647509/3601206.pdf
    • https://cdn-cms.f-static.net/uploads/4528959/normal_603e8251ca223.pdf
    • https://cdn-cms.f-static.net/uploads/4374696/normal_604760efa4a86.pdf
    • https://static.s123-cdn-static.com/uploads/4472776/normal_5ff655af529d7.pdf
    • https://cdn-cms.f-static.net/uploads/4480149/normal_606c791730f45.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jajisaparev.pbworks.com/w/file/fetch/144412299/75533067768.pdf
    • http://sodopateduke.pbworks.com/f/33331087913.pdf
    • https://uploads.strikinglycdn.com/files/e34472be-54ad-4cae-8a9f-6b87a22fa70f/6832909901.pdf
    • https://uploads.strikinglycdn.com/files/f86f5e04-5d97-43d9-9696-ea3799f0a3d6/nonaromematavoxivapadim.pdf
    • http://nigezid.pbworks.com/f/what_are_the_types_of_oral_literature.pdf
    • http://ruwezebom.pbworks.com/w/file/fetch/144424962/6778898009.pdf
    • http://dijakezepo.pbworks.com/w/file/fetch/144441489/watch_silenced_korean_movie_eng_sub_2011.pdf
    • http://kuzimotum.pbworks.com/f/juxipumelefidosefegogelu.pdf
    • https://uploads.strikinglycdn.com/files/e9c55dcc-fbe5-4019-9e48-3e5744a71a02/93751707597.pdf
    • http://viluxese.pbworks.com/w/file/fetch/144414156/names_for_pubg_generator.pdf
    • http://tazijebep.pbworks.com/f/72904698118.pdf
    • http://nosegawibaso.pbworks.com/f/73223632916.pdf
    • http://gabekujijud.pbworks.com/w/file/fetch/144538191/69374430195.pdf
    • http://negovijalulu.pbworks.com/w/file/fetch/144418941/why_does_it_smell_like_maple_syrup.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b0e.bin
f23ab816ca9d86b9b892ed06353e8a9c3e3299b64abd47ae4607a32ac784d4d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0E 4944 bytes
font_01_sfnt_off00012bc7.bin
ac4044b98a8d1655ae03da781d2b9608756ffeb9337a9b7dd22034a0c8393890
pdf-font-stream PDF embedded font (sfnt) at offset 0x12BC7 11328 bytes