Malicious PDF — malware analysis report

Static analysis result for SHA-256 903a8f5493402e6c…

MALICIOUS

PDF

73.6 KB Created: 2020-12-31 09:16:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 5fdb5d471c3d3a882d435eac7da3a5e4 SHA-1: b9a5eaf217329bc3772ddeb237f417e8d544fa6c SHA-256: 903a8f5493402e6c25f7fb28e663ca8c945d1f5a655c6981df867d51f3e1009c
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of a visual download button lure, combined with external URIs pointing to potentially malicious content, suggests an attempt to trick the user into downloading a secondary payload. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffine.ru/123?utm_term=properties+of+water+lab PDF link annotation
    • https://gixujadimi.weebly.com/uploads/1/3/4/7/134708567/47e47df3ab57.pdfIn PDF document text
    • https://cdn.sqhk.co/mugejufunij/dhin54T/53179673143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_5fa1abbc41d94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5fad55d78fdf9.pdfIn PDF document text
    • https://verefatodefi.weebly.com/uploads/1/3/4/7/134722939/xisomosapotet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404107/normal_5fbe9d0e18188.pdfIn PDF document text
    • https://buzufurabobozu.weebly.com/uploads/1/3/5/3/135304208/314e93e8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0692b760-3aa8-4ac4-a048-add827fca025/pc_isos_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00376cd8-4ec3-4423-9566-95eb42225a16/sims_4_more_romance_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/edtpa_instructional_materials_page_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/8210464960.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_off0000e4dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DC 5128 bytes
SHA-256: bbadb1760027728de47d180d512e2f477088de7f3a356357f2d13e857d5bb93e
font_01_sfnt_off0000f668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF668 10440 bytes
SHA-256: 9c1f88f09f93e5d4b02527da087ef5b9bb527b11ecbf6e64a9e991357a9593f1