Malicious PDF — malware analysis report

Static analysis result for SHA-256 6df3c4d3400fa76b…

MALICIOUS

PDF

95.4 KB Created: 2021-04-12 07:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: de648b077218c46d97a19c0c0e740db3 SHA-1: c865030361624797e85c8cb1d0d1cb8449182ae5 SHA-256: 6df3c4d3400fa76b68873417e6f2db55ebbb8867197eef54ee2111ea73655301
244 Risk Score

Malware Insights

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

This PDF file contains numerous links, many of which point to disposable hosting and redirect to known malicious infrastructure. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains keywords related to downloads, suggesting a lure to trick users into visiting malicious sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://dafemum.ru/strik?utm_term=vatican+assassins+pdf+free+download In PDF document text
    • https://cdn.sqhk.co/nepelusir/c4Jjchh/tibozulolo.pdfIn PDF document text
    • https://xanivumukil.weebly.com/uploads/1/3/1/8/131856382/4d2e2432c7157a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447466/normal_5fd6367fae711.pdfIn PDF document text
    • https://vogaxuruxav.weebly.com/uploads/1/3/4/3/134352923/9735082.pdfIn PDF document text
    • http://feremujidonigu.getenjoyment.net/41304651845.pdfIn PDF document text
    • https://cdn.sqhk.co/xasexuwosul/W3gUPKf/87403001650.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367951/normal_60262363d05c6.pdfIn PDF document text
    • https://baluwona.weebly.com/uploads/1/3/4/6/134611665/zojafidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379626/normal_60667f27c513d.pdfIn PDF document text
    • https://cdn.sqhk.co/bebomopakax/ohfhdbg/run_roo_run_download.pdfIn PDF document text
    • https://cdn.sqhk.co/jesupasuzoku/BoCFJje/liduwifimaluniz.pdfIn PDF document text
    • https://cdn.sqhk.co/dosovejozeb/m4u9bki/atkinson_shiffrin_model_of_memory.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491686/normal_5fed9ab369e91.pdfIn PDF document text
    • https://foworagajiwodim.weebly.com/uploads/1/3/0/9/130969946/d13a65f4e8501d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e6b56e3c-1b88-4cfb-972d-ab1702b0a06e.filesusr.com/ugd/8c0e65_5841d92947a54aff892eaf8f66ebdd98.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fapaga/loan_amortization_schedule_excel_spreadsheet.pdfIn PDF document text
    • https://9d1e48ad-bcd7-4831-9b7b-7108443a63b6.filesusr.com/ugd/136d07_e545b860a5464732982b20373b76527e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/potamotaz/casio_ga100-1a1_set_time.pdfIn PDF document text
    • http://judiserod.onlinewebshop.net/britax_advocate_clicktight_convertible_car_seat_-_limelight.pdfIn PDF document text
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_ea9844b61f1e4c2b99c7c964206a9915.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/82527999935.pdfIn PDF document text
    • https://dec4a425-646e-450a-80ca-a73a75d058ad.filesusr.com/ugd/ba3095_c90c207cd7a04bdf83ba8ef53bbdafc8.pdf?index=trueIn 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001382d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1382D 5204 bytes
SHA-256: 1c1f2a4dad6191f355c362884e1f1f0534ce4322c1568405fd9f27ff937cd2a5
font_01_sfnt_off00014a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A08 11092 bytes
SHA-256: d97e76ceeb66defdfa9c3401c2b4818d7d4a34ee5957ad291702395989fa3927