Malicious PDF — malware analysis report

Static analysis result for SHA-256 c41e58ed3c7151cf…

MALICIOUS

PDF

100.4 KB Created: 2021-03-25 17:45:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 575972146e8ee5dcf4bffbd88cbc0b65 SHA-1: 6083b822dd5a5ea4ff7e5626c7ab23edfaeed9ed SHA-256: c41e58ed3c7151cf6d70968ca48eafd2e99f9d3ceb4f19438b9398bff1098fab
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The file is a PDF containing numerous embedded URLs, many of which point to disposable domains and are used in a link farm configuration, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of 'curl_ultimate_tide_watch_manual.pdf' and a link to an AWS S3 bucket in the document text, alongside the PDF_URI heuristic, points towards the document being used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jottigo.ru/strik?utm_term=pioneer+vsx-1020-k+wireless+adapter PDF link annotation
    • http://visezuxopusifik.iblogger.org/accuphase_e210_service_manual.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489028/normal_5fccf3bde3184.pdfIn PDF document text
    • http://kulotufiw.mypressonline.com/70825082206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_601502ba53e2b.pdfIn PDF document text
    • http://nojosomefoviw.66ghz.com/tor_browser_apk_free.pdfIn PDF document text
    • http://pawarelubasiwu.iblogger.org/dolebafijedisa.pdfIn PDF document text
    • http://deliwubavamir.mypressonline.com/bovavumarunaxujewe.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/duxowemojetofejavavek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455684/normal_604aa36820165.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491159/normal_5ffdd2f0031e7.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/9a8febcf-050e-411c-b592-b501836c32ff/nursing_diagnosis_for_breast_cancer_ppt.pdfIn PDF document text
    • http://pizitibasowu.atwebpages.com/datulazafonomofapobo.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/ascaso_dream_service_manual.pdfIn PDF document text
    • http://xewinawe.epizy.com/4_c_s_of_marketing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b93c979c-8093-406a-ba85-03044d7e97b6/focusrite_scarlett_2i4_3rd_gen_usb_audio_interface.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/definition_of_content_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c76d7c83-91e1-4938-8101-f689a0ab1f5e/is_marketing_good_for_introverts.pdfIn PDF document text
    • https://s3.amazonaws.com/tinajabizoreguf/ccie_security_syllabus_2018.pdfIn PDF document text
    • http://kesolimasakifi.myartsonline.com/getem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9912975e-0347-4186-b0ee-f9ccccc95d2b/rip_curl_ultimate_tide_watch_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/piwanisaj/22281389950.pdfIn PDF document text
    • http://pimorem.epizy.com/adenocarcinoma_in_situ_cervix_patient_information.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
    • https://s3.amazonaws.comIn macro / runtime command snippet
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E0 5596 bytes
SHA-256: 62d3498e9e8ffdd7a0993c0557b62fbde2727ea9b46630abf87a2a1bc748adaf
font_01_sfnt_off00015a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A23 12044 bytes
SHA-256: c75986e39d403b5b9095a8e7e4eaa4e04b5405bb4291f4355184e671907b792c