Malicious PDF — malware analysis report

Static analysis result for SHA-256 de9844756780e5ec…

MALICIOUS

PDF

77.5 KB Created: 2020-11-24 06:24:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 76b005f4ced402d30c91a596460c1e23 SHA-1: c1f61c4647e42b291ac12e2b0996a98fe7e91ec8 SHA-256: de9844756780e5eca1fde75d9344cc9e1d1e5d5958e0b9a3102f66231bbeef7f
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, which is flagged as malicious. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to a 'student book PDF'. No scripts were extracted, but the presence of an external URI points to a potential download or redirection to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/strik?utm_term=viewpoint+1+student%252527+s+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451363/normal_5fa92f30402c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409621/normal_5fa823c4bda87.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/93e6ddc3-0c7e-4347-992e-54c1c12bb4ef/dinoroxigosekemufeka.pdfIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/free_fifa_coins_no_survey.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/hogwarts_school_list_for_first_years.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aeb27b2e-4ad6-48ce-842a-7e380127d206/tableau_force_verin_hydraulique.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b93d727-22b6-4b51-a760-e4d68c83fa85/imp_of_the_mind.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c12358e-bd13-4eff-baac-f1bd2454e68f/daily_language_review_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce365eaf-6758-4b2c-b750-23be530eebc5/49599945894.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53ef6e93-5a39-46f8-913a-c94deef75f49/45789114186.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000def9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF9 5044 bytes
SHA-256: 637c20499b6698cc4e8faf2a73ef862bfafdedd02f7d1f8a5e83a73ac060da92
font_01_sfnt_off0000f05e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05E 10336 bytes
SHA-256: 6d4773a1145b4b4c3505f238a54dd9ee88ff47d5d895d24b89533a14c02ae768
font_02_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 16180 bytes
SHA-256: 4af11798685c2dce325e1cbfdfba5176724424849ebd0cacb9bfbbe47b0df0e9

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