Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e5ee85861b384d0…

MALICIOUS

PDF

90.5 KB Created: 2020-12-11 21:57:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 8cba536554a3593d3a555af4afc4ff2c SHA-1: bd286b004e9a2f22067822038be8356e5a3f4dee SHA-256: 2e5ee85861b384d0d16ae2ac6adb1c0a36baf372410ef672d27b5976f05c4af0
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 that contains an embedded URL pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'worksheet answers', indicating a phishing or social engineering attempt to direct the user to the malicious URL.

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://traffset.ru/strik?utm_term=1.2+functions+and+function+notation+worksheet+answers PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/051e92be-c8f7-46f3-bb1b-0ee06b71212e/direct_flights_from_florida_to_charleston_sc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0928395-667b-497e-9975-23aa3ec65543/cyber_monday_printer_deals.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4443789b-ecc2-4a12-abbc-49216bd542e0/relosikolumuke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cf169bb-bc52-4d15-9e1e-f43d0208bc2b/65647029371.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/87577100301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3978dc20-50fc-40d5-900c-5ab02bd09aca/superacion_personal_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/foneniz/30553650216.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/343a78ec-8184-4eee-9417-f73459acb109/26909418383.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf18e4f98375720a59b44/1606283664763/60854183619.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0dd9fec917750a3d7b949/t/5fc255c36457125654882c3b/1606571463642/chemistry_worksheet_classification_of_matter_and_changes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf56e008845d0924816f5a/1606375136679/ap_chem_solutions_lecture_16_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02b52e1c-bd94-47eb-9d25-59cec80980bd/amine_caroline_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f08ebec3-58c5-4836-a027-c49ebc720cd0/south_africa_vs_new_zealand_rugby_live_stream.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001149b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149B 5236 bytes
SHA-256: 7a90c3df7329cfd735305c70e81106c886dce2b28a54d7eb7aa36f08cbc70b9c
font_01_sfnt_off00012675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12675 11832 bytes
SHA-256: fa74ff5b3943b0d13ddd6da48e640d4273f2809ef0cad90eb07f09e7c1ff5b8f
font_02_sfnt_off00014e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E0D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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