Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a08304667952457…

MALICIOUS

PDF

87.5 KB Created: 2021-05-10 17:55:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 9b1b07d49c45a9be672c2ac4f9d71b4a SHA-1: 50ed24b85337ad6a74a436fc4dc49d113f1351e1 SHA-256: 7a08304667952457881964f93d8211914128b2bbf7dceae71d454bd621eac013
166 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the heuristic 'SE_LOLBIN_RUN_COMMAND' suggest the document is designed to redirect users to malicious content, likely exploiting a PDF vulnerability or social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://zajinet.ru/strik?utm_term=writings+on+the+wall+piano+karaoke PDF link annotation
    • http://clipshd.design/tegonexosofzsh7t.pdfIn PDF document text
    • http://vvd.bar/87919893526ktcj.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/buzexetop.pdfIn PDF document text
    • http://fonudesuwobulud.mygamesonline.org/al_akhbar_egypt.pdfIn PDF document text
    • https://xebuzoxovekig.weebly.com/uploads/1/3/4/0/134018553/1041a0b1e2.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/manual_pedaleira_boss_me_25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425909/normal_5fd1e7ff60952.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390350/normal_602b825be9433.pdfIn PDF document text
    • https://pukizorot.weebly.com/uploads/1/3/1/3/131384201/toxugefaluk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407781/normal_6010fd76a49a9.pdfIn PDF document text
    • http://natikolom.site/avg_internet_security_updatesy1owf.pdfIn PDF document text
    • http://bilkan.fun/philips_tv_manualspi5jp.pdfIn PDF document text
    • http://mofobawosenej.mygamesonline.org/22097770474.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366628/normal_5fcced1c87d61.pdfIn PDF document text
    • http://plafond.xyz/brother_mfc-j410_printer_driverymb6n.pdfIn PDF document text
    • http://vonoxafaku.scienceontheweb.net/ceftriaxona_iv_bula.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonline.com/wupasidoletawokuxiruru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447271/normal_602550cf0cd32.pdfIn macro / runtime command snippet
    • http://joblanc.xyz/pobre_ana_chapter_6_answer_keygwsk5.pdfIn macro / runtime command snippet
    • http://hotita.fun/tower_defense_simulator_wiki_zombieslcelr.pdfIn PDF document text
    • http://xupulakikovuxo.mypressonlineIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://velelakolifuvu.onlinewebshop.net/6157483978.pdfIn PDF document text
    • http://namakanexir.atwebpages.com/how_to_do_wave_curls_with_flat_iron.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_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 5248 bytes
SHA-256: 42a59e477a7abc2826a5bb3d4f9302a14821e237cb686f410918d5e03c7fcdfe
font_01_sfnt_off0001081c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081C 15800 bytes
SHA-256: 2fc76e9fd2fae5d5d6f1c7f3b8a5aafc58c35f4dd0b9a4ad2161d00688fdda86
font_02_sfnt_off00013a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6A 16252 bytes
SHA-256: 58c5f81e2f3846f2b224decc1b049d475e28dc84cc3aee60e17cf3a23f93cd3d