Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7aa227619100869…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 19:40:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52eae4a57bda58569d7531d000167676 SHA-1: ea896a35229d27108e1ec5fbc1d14a3de4b23a66 SHA-256: b7aa22761910086994d8be2ea0974b4cea08154f396e7c01c9a4b90db8bbbd21
96 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains an embedded URL that directs users to a suspicious domain, likely to deliver a malicious payload or phish for credentials. The document body, though heavily obfuscated, appears to be related to academic content, suggesting a lure to trick users into clicking the malicious link.

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://midufefew.ru/wix?keyword=empirical+and+molecular+formula+problems+worksheet+answers
    • http://sagedix.medianewsonline.com/macarthur_capacity_assessment_tool.pdf
    • http://biwiroxefamir.mywebcommunity.org/brandon_sanderson_wiki_software.pdf
    • http://juvizex.sportsontheweb.net/vexedelunu.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_601e4267ef03f.pdf
    • https://static.s123-cdn-static.com/uploads/4458161/normal_6005e6242af53.pdf
    • http://siwupojotuj.getenjoyment.net/republic_by_plato_sparknotes.pdf
    • http://tafugegajotu.mygamesonline.org/art_active_release_technique_reviews.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/259867f8-2424-4959-b25a-419750470095/pride_and_prejudice_story.pdf
    • http://kakasis.onlinewebshop.net/fegase.pdf
    • https://uploads.strikinglycdn.com/files/0dba7f35-4a1f-4d57-8ab9-4f32e7b47282/pitanubazamex.pdf
    • http://megugasawixige.onlinewebshop.net/doterra_calmer.pdf
    • http://nufiwimuzobo.onlinewebshop.net/lawul.pdf
    • http://rofuvawitarul.atwebpages.com/what_is_the_storyline_of_the_nutcracker.pdf
    • https://uploads.strikinglycdn.com/files/1434377d-2d93-40d9-8232-a6dd4f147efe/91267256583.pdf
    • https://uploads.strikinglycdn.com/files/27ed4a14-2407-4730-8dcd-68ce93293250/apex_tv_universal_remote_app.pdf
    • https://uploads.strikinglycdn.com/files/f31e7e7a-0bf1-4f82-b951-0c71a2b56656/oster_convection_oven_costco_review.pdf
    • https://uploads.strikinglycdn.com/files/0b2e1df2-12ae-45e7-9182-ce207a0fd7cd/i_am_legend_book_summary_sparknotes.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_off0000f408.bin
1927068a42b41916b4c1ebe656c68766d9baf0368e549bfe8209a12c2ff34fd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF408 5648 bytes
font_01_sfnt_off00010724.bin
ec1f1de72f0a8b536dfcf4c90fcdf893c7ee013bf739b846f3f7f0267f6a17af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10724 10864 bytes

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