Malicious PDF — malware analysis report

Static analysis result for SHA-256 30ce99e5044f35a7…

MALICIOUS

PDF

81.0 KB Created: 2021-03-23 17:22:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ae862cfc0263f9c0b5d87e19b1f47881 SHA-1: 4634208995c8cdb623defc87e5a4a3cdc57655ec SHA-256: 30ce99e5044f35a7deec228f2d3ac0263e5a04a7f95d6488f6837729b9839678
96 Risk Score

Malware Insights

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

The file is a PDF document flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier. It contains an embedded URI pointing to 'https://jacksth.ru/award?keyword=enfermedad+por+deficiencia+de+vitamina+k+pdf', which is highly suspicious. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of the malicious URL and the trojan detection strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/award?keyword=enfermedad+por+deficiencia+de+vitamina+k+pdf
    • https://static.s123-cdn-static.com/uploads/4421042/normal_5fff77258c673.pdf
    • http://fakixigulidol.mywebcommunity.org/80355900718.pdf
    • http://bibuzikufaje.mygamesonline.org/citizen_eco_drive_calibre_8700_setting_instructions.pdf
    • http://wativeb.mypressonline.com/agudas_llanas_y_esdrjulas_ejemplos.pdf
    • http://heartcenteredequestrian.com/can_could_be_allowed_to_exercisesm1x1u.pdf
    • https://static.s123-cdn-static.com/uploads/4379601/normal_5ff47550085cc.pdf
    • http://xeboxemovev.66ghz.com/lejedi.pdf
    • http://hytri.com/2967454921858g38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gorajikunobixi/xopexon.pdf
    • https://s3.amazonaws.com/wobuzisibal/wisodogi.pdf
    • http://zexubadisaki.rf.gd/zutowazesax.pdf
    • http://pakafadudu.epizy.com/avast_antivirus_free_latest_version_filehippo.pdf
    • https://011f98f8-b45f-4578-a2fd-466b530f7845.filesusr.com/ugd/74e905_e0f5bb690aac48e3a4a6fb8b2b520942.pdf?index=true
    • https://f2f8a3c9-3ea7-4a25-b7e2-3e2749f32899.filesusr.com/ugd/f0e51d_e09f1a280a344f6e8503ce1a2db38413.pdf?index=true
    • http://mosazozude.epizy.com/sample_closing_costs_sheet.pdf
    • https://s3.amazonaws.com/fuwuzerijofa/xajijakakujon.pdf
    • https://s3.amazonaws.com/bopuxosavubare/42279678711.pdf
    • https://42190e62-4dca-482d-a077-ae7b222d7779.filesusr.com/ugd/b91392_0416240e08e743a8afc08dfa48876992.pdf?index=true
    • 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_off0000fb6c.bin
7450bba87536325ef64d667cc5f1c65fede9aa72aed4b6ae2458a64654b27156
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6C 5172 bytes
font_01_sfnt_off00010cfb.bin
4ab5390f0004f71790fc89af13d0cf8467032e382a1446170adfd2582bdac676
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFB 12364 bytes