Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a2e378bd5b55f2…

MALICIOUS

PDF

83.7 KB Created: 2021-03-24 11:59:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3a056fcdbb2a27fb997db25bfd14fbd6 SHA-1: 75121d8710c4039e51da455db67fc8db8a15e91c SHA-256: 79a2e378bd5b55f2c1f3631213cd81e7b70d736a8fd8957cb8e27c6aff9c4678
96 Risk Score

Malware Insights

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

The PDF was flagged as malicious by a ClamAV detection and an ML classifier, indicating a high likelihood of malicious intent. The embedded URL points to a suspicious domain, likely a phishing lure. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://resalured.ru/award?keyword=barrier+nursing+techniques+pdf
    • https://cdn-cms.f-static.net/uploads/4385436/normal_6058f7b55b308.pdf
    • https://zevugakarexavak.weebly.com/uploads/1/3/1/8/131857252/7289920.pdf
    • http://springtea.space/navujexolatekabunej8rdwx.pdf
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/8198877.pdf
    • https://vilawapa.weebly.com/uploads/1/3/2/7/132740366/goropimerodanapope.pdf
    • https://static.s123-cdn-static.com/uploads/4384145/normal_5ff8acf854be6.pdf
    • http://hempmap.ru/sawosapayhbfj.pdf
    • https://najatiruz.weebly.com/uploads/1/3/0/7/130738831/7582449.pdf
    • http://xabidewukolesas.66ghz.com/zibewizokaxena.pdf
    • https://cdn-cms.f-static.net/uploads/4460449/normal_60501901c6873.pdf
    • http://beduzevitugok.mypressonline.com/xitolo.pdf
    • https://zokukomusisitu.weebly.com/uploads/1/3/5/3/135323242/0458c30.pdf
    • http://tevutubiwij.getenjoyment.net/apply_problem_solving_techniques.pdf
    • http://tells.fun/lojamilugogutojefa3e8t9.pdf
    • http://rewita.fun/rank_the_states_on_the_basis_of_the3xtbp.pdf
    • http://xuxetosufuzo.getenjoyment.net/saram.pdf
    • http://naxiramomamaz.66ghz.com/aisi_lagi_lagan_javed_ali_ringtone.pdf
    • http://mynasert.online/serusivoksuktq.pdf
    • https://cdn-cms.f-static.net/uploads/4403533/normal_602f427456514.pdf
    • https://static.s123-cdn-static.com/uploads/4378830/normal_6002d4df06bab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duxepivol.myartsonline.com/pdf_agama_islam_kelas_11_semester_1_kurikulum_2020.pdf
    • http://razikonuwivomo.epizy.com/mitisamusuruxiwuwilosoku.pdf
    • http://wajalapivibobi.epizy.com/35219277755.pdf
    • https://s3.amazonaws.com/zuwimadaneb/ecdl_advanced_spreadsheets_exercises.pdf
    • https://s3.amazonaws.com/vososasoxumete/17518001770.pdf
    • https://s3.amazonaws.com/woneketelak/topukebuvozamegen.pdf
    • https://s3.amazonaws.com/jepavilutabilel/vikeviwifokopetuxevel.pdf
    • http://zenakezogutomu.onlinewebshop.net/bsa_medical_form.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f1.bin
94af4950a212107956d25a2ee797a0d0fec106cd55c0380b6355c61b4eba964c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 5560 bytes
font_01_sfnt_off000105d2.bin
337692c45606f004676be99e01b5564a66d3b99da284fcc4a8b380fe0912158b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105D2 11132 bytes
font_02_sfnt_off00012c05.bin
5b0d2701ab39d2f69c66d7d16c60d8db0b323aa0832947137e757b5401d27330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12C05 16060 bytes

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