Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ffdde0726e87c56…

MALICIOUS

PDF

89.5 KB Created: 2021-02-22 11:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 60606a3903669e3d4bb81ca6e4cc5b2c SHA-1: 6e3396cf38b1946ee701534b5236d777470ee62b SHA-256: 5ffdde0726e87c56b7ff222a65ecba8b963e8fc26f8d23727305e7defcbe5818
96 Risk Score

Malware Insights

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

The file is a PDF containing an embedded URI pointing to a suspicious domain, identified as malicious by ClamAV and an ML classifier. The document body, though heavily obfuscated, suggests a lure related to educational worksheets. The presence of external URIs indicates an attempt to redirect the user to a potentially malicious site for further exploitation or phishing.

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://maypoin.ru/wix?keyword=linear+equations+and+inequalities+in+two+variables+worksheet+answers PDF link annotation
    • https://cdn.sqhk.co/mowanideju/Hgdicuo/radiology_technician_salary_mn.pdfIn PDF document text
    • http://sokuzise.iblogger.org/gene_and_chromosome_mutation_worksheet_answer_key.pdfIn PDF document text
    • https://cdn.sqhk.co/xewafazuk/mfhiW3F/43861181506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490918/normal_6021798b027e3.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/ZWidjiz/wisasimuwigupewijas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd274fa85c4f.pdfIn PDF document text
    • http://fufirajonitav.22web.org/20397739056.pdfIn PDF document text
    • http://zinobinipote.22web.org/fegisafameza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478946/normal_5fc8d5542a250.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381973/normal_6026379d6ad3a.pdfIn PDF document text
    • https://cdn.sqhk.co/waxolulum/fIfsoTz/tomoxadozevesapogafim.pdfIn PDF document text
    • https://cdn.sqhk.co/sigidezok/cWmijia/fubikewu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/rubol.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/1-day_hormone_reset_diet.pdfIn PDF document text
    • https://s3.amazonaws.com/xewamejixolefaj/microscopic_anatomy_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kefiperizonofu/vlookup_2_sheets_excel_2013.pdfIn PDF document text
    • http://mukajuzata.rf.gd/analisis_del_entorno_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/wezukep/71579632340.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/bsplayer_apk_full.pdfIn PDF document text
    • https://s3.amazonaws.com/zafirawit/soundcloud_app_mac.pdfIn PDF document text
    • https://s3.amazonaws.com/wupixufekijax/budesonida_formoterol_aerosol.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_off0000fdaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAF 5336 bytes
SHA-256: c09421011caecabdd0a95b7f63075f6e6906111cb689c6a02570b9f5a79fc747
font_01_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 15868 bytes
SHA-256: 16506b99cc8ebaf5422834e975e49902ba94a14fb751d3ef69e9ff79caa1fa05
font_02_sfnt_off000141cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141CC 16244 bytes
SHA-256: e208d6fa2ecc1ee8b98dd0bd1684ffb5e3891779cf61ffdb9cb439440ba08a20

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